On Tuesday, January 13, 2015 at 9:10:45 PM UTC-6, John B. Slocomb wrote:
On Tue, 13 Jan 2015 17:06:04 -0800 (PST), Rex
wrote:

I'm trying to fix up a 1940s-vintage small-frame Llama.
It needs at least one grips screw, though I'd buy a hundred to get that one.
I have 5 of these guns, and most of them have some buggered slots, or threads or both.

The screw I need measures at M3 x .7mm, 5mm long
I think I can also use 5-36 US.

Both of those appear to be like hen's teeth.
If I can get the thread, I can adjust the length and the head diameter.
Need to be slotted pan heads

I have looked at MSC, McMaster-Carr, and Fastenal.
I have also dug through my lifetime accumulation of little fasteners until my fingers are raw.

Any suggestions on where I can source those?

Are you sure that is a M3-.7 ? I ask as my tap charts list only a
M3-.5 thread.
(But perhaps my thread chart is not complete)
--
Cheers,

John B.

John, I have checked and double-checked with a Bausch & Lomb measuring loup. It sure does look like .7, or .75. definitely not .5.