Will it turn a bit and then jam? If so try pulling the machine out so that you can tip the whole machine backwards/sideways to hopefully allow the object to fall away from the cover so you can then wiggle it and then unscrew it completely.
If it won't turn AT ALL I would guess it is just very tight and you need to persevere with a bit more force!
Good luck
Richard
December 2008
howtomendit.com for free repair help, information and advice.
