I need one because I have several cylinders one 1860 and 1 1858 that have nipples so tight that I cannot budge them. The 1858 is the worst because of the sharp edges around the nipple and the fact that the nipples are angled out from the center. I have tried WD40, heat etc and cannot budge them. I busted abot 4 wrenches trying to get them loose. Any suggestions. The 1858 is a Pietta and the 1860 is a Urburti.