drfallow said:Just fixed mine in 45 seconds. Thanks ever so much!
Bert Coules said:Almost exactly six months on from my fixing this - and thanks again to everyone who posted the solution - the noise suddenly returned. This morning I carried out the repair, using a long flat-bladed screwdriver, as before: a little fiddly, but I found the first time that I didn't need an angled tool - the hard part was moving the lock enough to get the pin visible, not subsequently reaching it. It will be interesting to see how long it lasts this time.