OK, more plastic replacing fun.... Just finished replacing most of the plastics - some appeared to be riveted and I don't have a tool for that - put the table back together but now the ball is getting stuck at the back of the battlefield in the drain. The battlefield is obviously not lowering as far down as it should be but it is resting on the two posts underneath which don't seem to have any adjustment. I did remove them to replace parts underneath. Am I missing something obvious???