The only type of wedge problem I've ever had, was in regard to temperature change. The 1st BP revolver I ever owned was/is a Uberti/Walker. I was so excited to take it deer hunting during the Michigan BP season. It was freezing cold outside and when I pulled it out to take a shot, I couldn't pull the hammer back as the temperature had effected the pistol to the point, I had to pull the wedge out (just a bit) to free the cylinder. As my old Dad would say, "Life long learning"!