doublegunshop.com - home Forums General Discussion DoubleGun BBS @ doublegunshop.com Boxlock sear engagment mystery

Revisiting an old project. I had made v-springs for a standard boxlock. Originally, the springs I made were too weak. Sears and hammers mated perfectly with the weak springs.

I pulled the springs and fixed them properly. The springs are pleanty strong now, but one sear no longer engages the hammer properly. Everything is in the same location as it was when the sears were engaging properly, but one sear will not engage at all.

I checked for burrs in the holes in the hammers and on the pins, nothing.

The pins roll true, so I don't think they are bent.

Could part of the spring be keeping the hammer from moving the last 1/64th of an inch?

Any other ideas on what could have gone wrong?

I really don't want to work on the hammer/sear engagement, as it was working fine with the weaker springs.

Thanks for any ideas.

Something is moving under pressure. Have a worn pin or hole? Sounds like you are looking for .015

bill

I solved the Mystery!

The fold of the springs was spread slightly when I reworked the springs. The extra thickness was preventing the hammer from rotating fully and locking with the sear.

I took some of the thickness off of both springs and now everything is locking up well. It never occured to me that the hammer tolerances would be that tight where it passes over the fold of the spring.