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[Shackeng]

I did one several years ago, but don't remember how.
And telling you how to change the ignition switch on a Piper Cherokee, which I did today, won't help you very much

Nope, and even though I've changed them on a Beverley, Anson and Shackleton, doesn't help me much either!

In fact IIRC, I've still got a set of Hastings ign switches, unless I sold them. Hmmm, can't remember, but I haven't seen them for some time.

[Doctor Gollum]

First question, is the TD switch the same as a petrol one?

If yes, the the picture doesn't show the correct area, needs to be more to the right to show the alloy casing on the column...

Requires a 4mm Allen key to release the lock tab, and when I see the hole, I shall be able to identify it... No pun intended

[Andy B]

is this what you were looking for? http://www.omegaowners.com/forum/index.php?topic=90601.0 The last switch I replaced was a looong time ago on a Manta .... though I removed a barrel to replace the tumblers on my Omega

[Doctor Gollum]

That's it

The whole into which you carefully insert the short end of your 4 mm Allen key is just visible to the upper right of the assembly pictured in first pic This removes the lock barrel...

To release the switch assembly shown in your pic, position the screwdriver vertically into the hole at the side nearest the key, needs to be pushed in squarely towards the centreline of the mechanism.

The second pic in the guide shows clearly what you're aiming to release

[Andy B]

....

The whole into  ....

is that all of it or just part of it? 

[Doctor Gollum]

....

The whole into  ....

is that all of it or just part of it? 

It goes into the whole hole

[Andy B]

....

The whole into  ....

is that all of it or just part of it? 

It goes into the whole hole

 

[Shackeng]

I think there may be some confusion here. Firstly, thanks for the guide reference, which I have seen already, hence my request for clarification of the instructions. I have already removed the key barrel with no difficulty, and have removed the grub screw and the switch & connector assembly from the steering lock (into which the barrel fits), with the switch in position 1.
It is the instruction referring to the connector release hole that I am asking for clarification on.
Insert a small screwdriver into the connector release hole, keeping the screwdriver at the key end of the hole,  and press to release the latch, at the same time as pulling / levering the connector off the switch.
In the guide picture after connector removal, the latch is black, and it looks as if it should be pressed in, but mine does not wish to move in any direction, and to avoid breaking anything, I am going very gently, and I think perusal of the new switch will help.

[Doctor Gollum]

Barrel back in and in position 1 then try again...

[Shackeng]

As quoted above it is in position 1.

[Doctor Gollum]

With the key and barrel in situ?

Pic shows assembly at position 0.

As above, with key and barrel in place and turned to position 1, insert a small flat screwdriver parallel and adjacent to the right hand/key side of the square hole. Apply pressure towards the centreline of the lock assembly.

Removing the grub screw might prove to have been premature.

[Shackeng]

Cheers Al, my switch is definitely at position 1, double checked it before removal of barrel, and checked again since removal. I removed the grub screw to examine the assembly more easily. But once certain of the tab to be pressed after examination of new switch, I will replace it to allow more purchase on the connector. Thanks for confirmation that it has to be pressed towards the centre, as suspected from the guide pic.

[Shackeng]

The disconnection of the switch from the connector was easy once I could see the new one, and its retaining tang. However having removed the barrel with some difficulty, I discovered that the retaining latch is broken, the bit which is released by insertion of, in my case, an Allen key. So if anyone has a spare barrel, or can recommend a good aftermarket replacement, I would be grateful.

[omegod]

I've got one on the breaker, if i can release the bugger. They are a tad fragile and I've had the same issue

[Shackeng]

I've got one on the breaker, if i can release the bugger. They are a tad fragile and I've had the same issue

Thanks OG, I had no trouble getting the barrel out, but discovered it has a snapped retaining latch. The new switch and connector went on with no bother.