Yeah i can see what im meant to do with it, i know it should slide apart to allow the top of it to fit the whole and then slide back together to expand into the shape of the hole. Problem is it will not seperate again at all........its drivin me mad. I know i shouldnt really have to force it, tried for ages today and gave up. Might give it a go later.
Is there catch or release on it, i dont think there is but something is stopping it coming apart therefore i cant put it back where its meant to be!
Any suggestions appreciated.