Replacement for older FLAT-latch?

[VictorLouis]

Have an old (pre?) M12 flat-latch. I'd like to get a modern thumbpiece on there, but the threaded shank looks much smaller than the retaining nut on today's latches. I happened to catch an ad for a 'Classic' re-issue for sale locally. The nut LOOKS much smaller, LIKE it may be compatible. That larger dished thumbpiece would be a much appreciated replacement. Does anyone know if it will work?

 

[chief38]

I don't own a M12 however I do own several early Baby Chief's with a similar style Flat Latch. The Baby's Flat Latch is fastened with a very small screw while the more modern latches you want to install are fastened with a nut. As far as I know the two are not compatible. If there is an "adapter kit" or conversion Bolt I am unaware of it.

 

[torizus]

I'm pretty sure you would have to replace the bolt in order to upgrade the latch. A newer K frame frame bolt along with the preferred latch would probably work. Could very well be a drop in fix but may need some minor gunsmithing touches.

I vaguely recall doing this for a friend who for whatever reason wanted a stainless thumb latch on a perfect functioning orginal M38 J frame.

 

[Tired Gunsmith]

You will have to replace the thumb piece and a nut to fit as well as a proper bolt.
The bolt will NEED fitting. It was never a drop in part

 

[chief38]

Not trying to hijack thread, but the M12 should be sparingly shot with mild loads and at least to me would be somewhat unsuitable to be a proper defensive weapon. Not bashing your M12, but it's a well known fact they do not stand up to repeated firing of SD strength ammo well. That is one reason to relegate it to a collectible and a seldom fired gun and so converting the Thumb Latch on it might not be all that much of a priority.

Again, not trying to ruffle feathers here, but it is what it is. There are certainly better SD S&W's out there than the fragile M12. Just my opinion.......

 

[Old cop]

One thing I've learned about J frame flat latch revolvers is to check all the frame screws after a range trip. Some, especially the cylinder latch, can work lose.