maybe a case of grannies and eggs (apologies in advance) but don't forget to turn it the correct way - easy if italian, both sides unscrew the 'normal' way [anti-clockwise], if it's english, then the left side is 'normal', the right side is a left-hand thread so unscrews clockwise (english = left is right and right is left!)
+1
also a good idea is to tighten the cup into some jaws and get it off by spinning the frame....works a treat
+1
+1