K frame Hammer Nose Bushing

[dtech99]

I need to replace the hammer nose bushing in the frame of a 64-3 K frame. It is a very high mileage modified target gun and the bushing has become oval resulting in hitting too low on the primer. I have the bushing on order so I have not seen what it looks like. Can someone explain a technique for pushing out the old and pressing in the new.
Thanks
Roger

 

[bgrafsr]

There is a special tool that fits in the rear of the bushing and this is struck with a hammer, which forces the bushing out of the frame. When the bushing is forced out, it leaves a ring or burr, around the hole in the frame. Leave it. Line up the new bushing in the frame, in the exact same way as the old one was, and then using a steel rod, that is tapered on the end to fit the diameter of the bushing, and that also fits the bore diameter closely, tap the new bushing into the frame. You will then need a crimping tool that will force the ring or burr into and around the new bushing to stake it in place.

Probably best to have an S&W repair station do the work, as they should have the required tools needed.

 

[Bullseye Smith]

Take a small punch that is smaller then the bushing and by hand push down to the tapper edge of the main body and insirt into the bushing and turn. This will do one of two things, if the bushing is bad it will start to push it out, #2 if it is good it will roll it back out to fit the opening.

 

[dtech99]

Bgrafsr:
Your detailed explanation for replacing the bushing was perfect. I ground a punch to fit the back side of the new bushing and tapped it out of the frame. The bur was around the hole as you described. I then ground a slight taper in a steel rod so that fit the ID of the bushing hole. The rod was longer than the barrel when inserted through the barrel and in contact with the frame. The new bushing was tapped into the hole. I used the same rod to roll the bur down to capture it in place. The end result is that the hammer nose firing pin strikes the primer right in the center when previously it was striking the primer low.
Thank you for your assistance.
Roger