BAM Bushing Installation Instructions
1) First, follow the basic disassembly procedure for the Ruger Mark III 22/45 as outlined in the Owner's Manual, or refer to the numerous youtube videos and online pictorials. Your Ruger Mark III may differ from mine, but the basic operating principles are the same. In depicting this process, I am merely outlining the method I used to perform the procedure described within. You and you alone are responsible for the actions you perform on your own firearm, and assume all responsibility for verifying that removal of the Magazine Disconnector is legal according to your local laws.
6) Use a small screwdriver or other tool to gently push the Sear Spring toward the rear of the frame until it clears the groove in the Hammer Pivot Pin. While holding the Sear Spring clear, very slowly push the Hammer Pivot pin from the other side toward the direction of the Sear Spring until the Hammer Bushing is freed from the Hammer Pivot Pin.
NOTE: Yellow text only applies to 22/45 models.
7) If the Hammer Pivot Pin is pushed too far, the Sear Spring and Safety Lever Assembly will need to be reassembled before the remaining fire control components can be installed.
11) Another view for reference.