I have been collecting parts for a Ruger old army and on trying to remove the nipples from the cylinder found they were so tight that I couldn't get any of them our. I gave them a couple of taps with the nipple wrench over each nipple with the hopes of breaking them loose. Then oiled them top and bottom and set them aside for twenty four hours. I still couldn't get them to move. I decided to try something else to loosen them. I put the cylinder in my vice, it has wood to keep the jaws from damaging anything. I set the mouth of the chambers up and balanced the cylinder on the metal in the center of the jaws, put one cylinder at 12 o clock and tightened the jaws. I then found a flat bottom punch that would rest on the bottom of the nipple, in my case it was about a 3/16 flat faced end of the punch. I then gave each nipple a couple of whacks with a four ounce hammer, moving each opening to the 12 O clock position before giving each nipple a couple of whacks. On removing the cylinder and trying each nipple with the wrench, I removed the first five nipples, one was stuck! I replaced the cylinder in the vice and gave it another couple of whacks, and I got the last one out! These nipples had been in the cylinder for 42 years, and were probably stuck when the revolver was put away! And the nipples were undamaged! I was dreading having to drill them out without damage to the threads! The shock of tapping them from the bottom gave them enough shock to get them out! They were still damm tight! So if you have some nipples in a cap and ball pistol you haven't been able to get them out, this might work for you! Best regards, the toolman.