last week I picked up a .54 T/C renegade from a pawn shop. ($200). In really good shape, a little surface rust in bbl, cleaned up good. The nipple and the clean out screw appear to be "frozen" in place...I sure can't move the nipple with a nipple wrench, nor the clean out screw with a screw driver. I've been soaking them in Liquid Wrench for a couple of days...does anyone have any other ideas on how to get them moving? Hank