I didn't fully appreciate Masters words at the time, but they where ringing in my ears as I fitted the poxy things in the LPG kit, and again as I swappd them out for spring clips gathered from another car. They seize, they wear the thread, the thread brakes, they have a flat on the worm gear, they can't automatically adjust to expansion and hence they ALWAYS leak. Grrrrrrrr ;
The millions of them sold for the last 94 years
always leak? This seems unlikely, especially considering the uses they get put to. I've had more problems with the constant tension clamps on the Omega than I have with all the other cars I've owned over the last 27 years. Which is why I bin the spring clamps and replace them with a branded clip. Worm drive clamps cover a wide range of sizing, and the overlap is good, so finding one that fits the diameter correctly(use the smallest one possible) is easy.
As for the much mentioned expansion, once again, just how much do the components on an engine
actually expand? Add the expansion in the clamp, and the give in the hose, and the expansion requirement is even smaller. My suspicion is that we'd struggle to measure it with everyday instruments, which makes the whole point moot.
The flat for the worm gear
can be a problem in smaller sizes, so care must be taken.
Jubilee clips do rust, but then so do the spring clamps as they're made of steel! A seized worm is easily removed with decent side cutters.