I am looking for a sex bolts (sometimes they are also called hidden
McMaster has them in #10 tread or larger.
I need something more like thread #4.
BTW These are going to hold two scales of the fixed knife.
There are lots of suppliers suggested, but apparently you're needing
really small ones.
You might consider making your own custom parts, easy to do with a
lathe (even a mini lathe), or possibly a small drill press.
You could probably use small rivets, drilled (blind or thru hole) and
tapped to accept a short section of screw thread (two female halves of
specific length joined with a threaded section cut from a screw or
If you didn't have any intention of removing them in the future, you
wouldn't need to cut screwdriver slots in the heads, but instead, just
loctite the threaded areas and tighten them with fingertip friction.