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[feeutfo]

Plus, the design I had involved pulling on the number plate itself to open it. Too stiff a catch or spring may involve the number plate bending, deforming, or the bolt holes pulling through the plastic or the plastic deforming around the number plate holes, or distorting or obscuring the numbers over time.....if the plate bracket was the same size as the number plate then fine as fingers could pull on the metal behind instead.

As TB pointed out, his magnets where too stiff to open the bracket, so had to be spaced away, if applied to the design on my old car there is a risk of pulling the number plate off the bracket altogether. Poppers or Velcro catches may be either too stiff to pull off a flat surface, if you see what I mean. Poppers can be pulled off from one side at an angle, and Velcro pealed away from one corner. Magnets can slide of far easier than when pulled directly away.

Spring loaded seems simplest, although TB made his magnets work well it's in addition to the spring needed anyway.

But it's all by the by, been searching for most of the afternoon and only found my own car advert to be relevant 

[SJKOO01]

Rather than springs, have you thought about using the Dzus fasterns like they use on race panels ?.

http://www.demon-tweeks.co.uk/Motorsport/Fasteners_&_Hose_Clips/Quick_Release_Fasteners/Dzus_Panex_Range_D_Ring_Fastener/1550/2340

http://www.demon-tweeks.co.uk/Motorsport/Fasteners_&_Hose_Clips/Quick_Release_Fasteners/Dzus_Fastener/1550/2273

[TheBoy]

Plus, the design I had involved pulling on the number plate itself to open it. Too stiff a catch or spring may involve the number plate bending, deforming, or the bolt holes pulling through the plastic or the plastic deforming around the number plate holes, or distorting or obscuring the numbers over time.....if the plate bracket was the same size as the number plate then fine as fingers could pull on the metal behind instead.

As TB pointed out, his magnets where too stiff to open the bracket, so had to be spaced away, if applied to the design on my old car there is a risk of pulling the number plate off the bracket altogether. Poppers or Velcro catches may be either too stiff to pull off a flat surface, if you see what I mean. Poppers can be pulled off from one side at an angle, and Velcro pealed away from one corner. Magnets can slide of far easier than when pulled directly away.

Spring loaded seems simplest, although TB made his magnets work well it's in addition to the spring needed anyway.

But it's all by the by, been searching for most of the afternoon and only found my own car advert to be relevant 
 

On mine, the magnets are the primary method of keeping it closed and rattle free, the spring is there to ensure it stays closed (if it gets jolted over a bump, enthusiastic 'handling tests' etc).

I am toying with a simple (unsprung) hinged flap, with some kind of twist-90degrees type catch...

[aaronjb]

Plus, the design I had involved pulling on the number plate itself to open it. Too stiff a catch or spring may involve the number plate bending, deforming, or the bolt holes pulling through the plastic or the plastic deforming around the number plate holes, or distorting or obscuring the numbers over time.....if the plate bracket was the same size as the number plate then fine as fingers could pull on the metal behind instead.

As TB pointed out, his magnets where too stiff to open the bracket, so had to be spaced away, if applied to the design on my old car there is a risk of pulling the number plate off the bracket altogether. Poppers or Velcro catches may be either too stiff to pull off a flat surface, if you see what I mean. Poppers can be pulled off from one side at an angle, and Velcro pealed away from one corner. Magnets can slide of far easier than when pulled directly away.

Spring loaded seems simplest, although TB made his magnets work well it's in addition to the spring needed anyway.

But it's all by the by, been searching for most of the afternoon and only found my own car advert to be relevant 
 

On mine, the magnets are the primary method of keeping it closed and rattle free, the spring is there to ensure it stays closed (if it gets jolted over a bump, enthusiastic 'handling tests' etc).

I am toying with a simple (unsprung) hinged flap, with some kind of twist-90degrees type catch...

Have a look into Dzus Fasteners, that sounds like precisely what you want - either screwdriver operated or via a built in D-ring:
http://www.motorcycletoystore.com/sport/shop.php/motorcycle-fasteners/dzus-fasteners/p_33.html

Come in two parts - the fastener plate and the fastener itself. Mount plate to bumper, mount fastener to numberplate et voila.

[Entwood]

On the aircraft many panels require  "easy access" but MUST be very secure. This is done using DZUS fasteners.... several types exist from screwdriver types to handle (wing nut) types ..

http://www.tpub.com/content/aviation/14014/css/14014_109.htm

HTH

[TheBoy]

Plus, the design I had involved pulling on the number plate itself to open it. Too stiff a catch or spring may involve the number plate bending, deforming, or the bolt holes pulling through the plastic or the plastic deforming around the number plate holes, or distorting or obscuring the numbers over time.....if the plate bracket was the same size as the number plate then fine as fingers could pull on the metal behind instead.

As TB pointed out, his magnets where too stiff to open the bracket, so had to be spaced away, if applied to the design on my old car there is a risk of pulling the number plate off the bracket altogether. Poppers or Velcro catches may be either too stiff to pull off a flat surface, if you see what I mean. Poppers can be pulled off from one side at an angle, and Velcro pealed away from one corner. Magnets can slide of far easier than when pulled directly away.

Spring loaded seems simplest, although TB made his magnets work well it's in addition to the spring needed anyway.

But it's all by the by, been searching for most of the afternoon and only found my own car advert to be relevant 
 

On mine, the magnets are the primary method of keeping it closed and rattle free, the spring is there to ensure it stays closed (if it gets jolted over a bump, enthusiastic 'handling tests' etc).

I am toying with a simple (unsprung) hinged flap, with some kind of twist-90degrees type catch...

Have a look into Dzus Fasteners, that sounds like precisely what you want - either screwdriver operated or via a built in D-ring:
http://www.motorcycletoystore.com/sport/shop.php/motorcycle-fasteners/dzus-fasteners/p_33.html

Come in two parts - the fastener plate and the fastener itself. Mount plate to bumper, mount fastener to numberplate et voila.

How much

Another idea was those press to latch/unlatch fasteners, again on a hinged flap. Or use a couple of them along with the magnets, and no hinge.

[Andy B]

.....
Another idea was those press to latch/unlatch fasteners, again on a hinged flap. Or use a couple of them along with the magnets, and no hinge.

Velco would be your cheapest!   

[TheBoy]

.....
Another idea was those press to latch/unlatch fasteners, again on a hinged flap. Or use a couple of them along with the magnets, and no hinge.

Velco would be your cheapest!   

I doubt that would pass an MOT. Also, when the velcro gets wet over time, the adhesive is likely to go off...

[aaronjb]

Plus, the design I had involved pulling on the number plate itself to open it. Too stiff a catch or spring may involve the number plate bending, deforming, or the bolt holes pulling through the plastic or the plastic deforming around the number plate holes, or distorting or obscuring the numbers over time.....if the plate bracket was the same size as the number plate then fine as fingers could pull on the metal behind instead.

As TB pointed out, his magnets where too stiff to open the bracket, so had to be spaced away, if applied to the design on my old car there is a risk of pulling the number plate off the bracket altogether. Poppers or Velcro catches may be either too stiff to pull off a flat surface, if you see what I mean. Poppers can be pulled off from one side at an angle, and Velcro pealed away from one corner. Magnets can slide of far easier than when pulled directly away.

Spring loaded seems simplest, although TB made his magnets work well it's in addition to the spring needed anyway.

But it's all by the by, been searching for most of the afternoon and only found my own car advert to be relevant 
 

On mine, the magnets are the primary method of keeping it closed and rattle free, the spring is there to ensure it stays closed (if it gets jolted over a bump, enthusiastic 'handling tests' etc).

I am toying with a simple (unsprung) hinged flap, with some kind of twist-90degrees type catch...

Have a look into Dzus Fasteners, that sounds like precisely what you want - either screwdriver operated or via a built in D-ring:
http://www.motorcycletoystore.com/sport/shop.php/motorcycle-fasteners/dzus-fasteners/p_33.html

Come in two parts - the fastener plate and the fastener itself. Mount plate to bumper, mount fastener to numberplate et voila.

How much

Another idea was those press to latch/unlatch fasteners, again on a hinged flap. Or use a couple of them along with the magnets, and no hinge.

£18 for 4..
http://www.mandp.co.uk/productinfo.aspx?catref=516293&tier1url=Bodywork&tier2url=Fasteners&tier3url=Mr-Fastner

[Andy B]

....
I doubt that would pass an MOT.

I can't see why, mine are both fixed to the car with the double sided sticky tabs, ie no visible fasteners, Mr MOT Man doesn't grab hold to see how well fixed they are (mine doesn't).

Also, when the velcro gets wet over time, the adhesive is likely to go off...

If both bits are properly cleaned, I can't see the glue holding any less well than the way my number plates are held ...... the Velco won't be taking the weight of the plate & hinge.  :-/

[SJKOO01]

Or you could try from the usual place if you don't want to pay too much !

http://cgi.ebay.co.uk/DZUS-FASTENERS-FAIRING-PANEL-FASTENERS-4-PACK-/270655937981?pt=UK_Motorcycle_Parts&hash=item3f0459ddbd

[feeutfo]

Before I fitted the bracket, I was happy just to unscrew the existing number plate screw on one side and let the number plate tilt down to reveal the filler, just keep the screw driver in the boot.

But I think the bracket is more appealing,more convenient. if only we could find the maker   

[feeutfo]

Found it, PDF catalogue third of the way down, described as "number plate hinge system"  silly me not googling that  . Anyway, looks exactly as mine, sorry, my old one.

http://www.fesautogas.co.uk/catstp2009.pdf

[feeutfo]

Just emailed them for a price.

[Entwood]

Found it, PDF catalogue third of the way down, described as "number plate hinge system"  silly me not googling that  . Anyway, looks exactly as mine, sorry, my old one.

http://www.fesautogas.co.uk/catstp2009.pdf

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