Hey guys: My keg cutter and welder is ready for the keg. He asked that I remove the center ring and tube and clean the keg out. I got only 1 ring off broke the tip of a screwdriver and failed on both tubes. There has to be a trick. What is it?? He said to line up the notches but I can't get the center tube to turn at all. I assume it turns to the left. Any advice would be appreciated. Thanks, Charlie