The cylinder on my S&W M60 J-frame has always had a minor sticking problem whenever I try to pop it out. On returning from the range today, after cleaning the bore, I find that the cylinder will not come out at all without forcing it. The more I try it the more pressure is required to open the cylinder. Indivdually the parts seem to be working fine; but, I think that the head of the center pin is either getting hung up between the bolt that the thumb latch controls and the edge of the opening, or the bolt is worn to the point of not being able to press the center pin all the way clear so that the cylinder can swing out. I bought the gun new about 2 and 1/2 years ago and nary a problem until now. I would appreciate any help. Take care.