[COLVERT]

Originally Posted by SD1too

Hi Lee,

Yes, I spotted that as well. Believe it or not the thread is deliberately distorted at manufacture presumably to prevent the spigot being wound out completely and acting like a bullet. Even the brand new strikers' threads were like that.

I can see your logic Lee but I don't think it would. The considerable force of the spring would prevent involuntary rotation.

Looking forward to hearing from anyone who can move their nut in situ today.

Simon

Not sure about that. The threads have a force in one direction induced by the spring. Any minute vibration will have a tendency to unscrew the bolt due to the uni-direction force generated by the angle of the thread.

I have often discovered loose screws in electrical plugs and sockets after several years use. ( Thermal expansion and contraction makes them slowly unscrew. )--This same force of hot and cold will cause those bonnet screws to undo unless firmly locked by the associated lock nut.


Just my observations though I'm happy to be proved wrong if that's the case.

Probably why thread lock is popular.----