Problem reassembling my S&W Revolvers

[Rolan_Kraps]

Lately I've been trying to tune my S&W revolvers by lightly stoning the engagement surfaces of the hammer and sear.

So far, after I've reassembled my Model 10 and my model 640, I've run into problems getting the hand to engage the back of the cylinder.

Is there some "reassembly trick" that I'm missing?

 

[Rolan_Kraps]

Lately I've been trying to tune my S&W revolvers by lightly stoning the engagement surfaces of the hammer and sear.

So far, after I've reassembled my Model 10 and my model 640, I've run into problems getting the hand to engage the back of the cylinder.

Is there some "reassembly trick" that I'm missing?

 

[Wayne M]

Sounds like the hand torsion spring has slipped off the stud on the hand. If that happens the hand will not be pushed toward the cylinder when the gun is assembled. The spring is a small part inside the trigger; pinned in place on the pre MIM guns but just inserted into a hole in the hollow portion of the trigger in the current guns. That's what I'd check first.

 

[bountyhunter]

Originally posted by Rolan_Kraps:
Lately I've been trying to tune my S&W revolvers by lightly stoning the engagement surfaces of the hammer and sear.

He's right, the spring has slipped off the hand if it doesn't hold tension. As for stoning the hammer and sear faces, that has probably paid for more gunsmith's kids going to college than any other thing. You have about .006" of surface hardening. Go through it and the part is junk.

 

[Rolan_Kraps]

OK, that fixed the K-Frame, but I can't find a spring on my 640-1 trigger. The only diagram I can find looks like it's an external spring. Does anyone know?

 

[Rolan_Kraps]

Can someone show me a picture or diagram of how the spring mounts on the Model 640 trigger/Hand?

 

[HEADKNOCKER]

Have a Look at this post with a repost of 500 Magnum Nuts original pic, Pg 5 of the FAQs in the revolver area..
Hope this helps you Rolan..
Gary/Hk
Page 5 of FAQs

 

[Bullseye Smith]

Rolan it sounds like you lost the spring, go to site below and it has a drawing and you can order the part.

http://www.e-gunparts.com/productschem.asp?chrMasterModel=1980z640

 

[Wayne M]

The spring for this one actually is inserted into the rear of the trigger. You'll need a light to look into the hollow rear portion and a padded vise will help to angle the trigger the way you want. The short end of the spring inserts into a small hole and often can come out and fly away if you're not expecting it. Check Midway or call Smith and get half a dozen or so(make sure you get the spring for the J frame). Small needle nose pliers and trifocals will help when you actually get down to it. It's really a neat setup and easy to replace after you've done it once. Good luck!

 

[Rolan_Kraps]

Thanks guys. I've got some on order from Midway.