We have a pop up waste on our bath which worked fine for a few months but then the pop up part stopped working, had to wedge it open etc. We then had to start screwing it on and off... and now the plastic bit we\\\'ve been screwing the \\\'led\\\' into appears to have raised itself up so that when we screw the cover on it is half a cm away from bing closed. I can\\\'t move it back down at all and am mystified. Help! Is there something obvious that I should be doing? Or do I have to take the bath panel off (quite an undertaking) and start again? Any suggestions gratefully received.