I'm a S&W guy who recently bought a .38 Police Positive (my only Colt revolver). I've fired about 200 rounds through it and really like it. I removed the cylinder to clean it and did something stupid in reassembly. I pushed the pin in that holds the cylinder in place and then attempted to screw the holding screw in without realizing it had a groove that had to engage the pin. Now I can't get the pin out. Any ideas?