Good ideas everyone, have used some of them in the past, but am glad to report I've never had a 'really' stuck nipple. Just lucky I quess. I always put a dab of high temp silicone grease or anti-sieze material on the threads when I reinstall the nipples. Maybe I'm fortunate because I always remove and clean the nipples everytime I clean the gun. It's a pain, but quess clean nipples equals easy removal. It's easier to clean the residue from the area of the cylinder the nipples reside also without having them in the way.
Pettifogger-Your nipple wrench made from the socket is a good one. From your picture it looks like its made from a 3/8" drive socket, but due to the size of the nipples I would assume a 1/4" drive socket would be the one to use. Or did you turn the sides of a 3/8" socket?
Long Johns Wolf-As long as your posting on this thread, gonna take the opportunity to tell ya how I enjoy and appreciate your FROCS website. Have gotten alot of information off of it. I don't own any Belgium Colts, but quess ya don't have to own one to appreciate em'. Courious too, how hard or what steps do you have to take in Germany to buy and own cap and ball revolvers and buy and posess black powder and percussion caps. Just wondering, so far here in the USA no problem except with the limitations on how much black powder you can legally store in your home. Even that isn't something that is checked on, except if your a FFL dealer selling it. Just as a side note, my Grandfather came over to the US at age 13 in 1897 from Stettin, Germany and my Grandmother came in 1909 at age 21 from Kassel, Germany (both my Dad's parents). If your familiar with these towns, I'll send ya a PM, maybe you may know some of my German relatives-who knows, maybe were related.
Merry Christmas to all!!!