I recently picked up what I believe to be an old model Blackhawk .45 ACP cylinder due to the shorter gas ring. It fits and appears to time up correctly in my large frame 45 Vaquero with the exception of the excessive end shake. What would be the best way to correct this? Shim, having a Colt SAA style bushing fitted, or having the gas ring stretched? Any recommendations on the best way to measure for the shim needed or a gunsmith who could do the gas ring stretching or bushing install? Thank you in advance for any suggestions