M3.5 filler screws?

[.22LRGUY]

Hey guys-wondering if any of you have a source for low-profile truss, or dome-head machine screws-M3.5

I removed the front sight on a CZ rimfire and there is a single hole I'd like to fill. I've Googled what thread pitch it is, that seems to be the consensus. I'd prefer not to use a grub screw, rather, cover the hole entirely. The lower the dome head, the better. Socket drive preferred.

I may be a dreamer, but that would be the ideal one if it existed. I'm prepared to cut or grind a longer one down if required, this sure wouldn't need to be long.

Appreciate any help. Thanks!

 

[smokinbarrel]

I have made my own filler plugs. Turn or file heads to profile you want then slot with a hacksaw blade that you have ground the wave out of. Heat in a flame until they turn blue.

 

[Jahnj0584]

Install the setscrew "upside down"

 

[.22LRGUY]

I have made my own filler plugs. Turn or file heads to profile you want then slot with a hacksaw blade that you have ground the wave out of. Heat in a flame until they turn blue.

^good idea, thanks! I used my 14V drill as a lathe to shape a Browning firing pin recently, and some needle files. I'm open to the idea of making imperfect solutions work.

Install the setscrew "upside down"

^considered just using a grub screw, but while the front sight was straight...the drill/tap job CZ did isn't the best I've seen. I'm hoping for a small head to cover the edges of the hole where they meet the surface of the barrel.

 

[analemma]

M3.5x0.8 screws are pretty common in hobby robotics and drones. You might try a hobby shop that carries them. I removed the small burr on the barrel with a very light touch from a countersink. Cut the head off the screw and slot it (I used a Dremel cutoff tool, as it makes a very thin slot) then trim the screw to the length you need. Mine was stainless, but a touch with a felt-tip and it is pretty nearly invisible. Rimfire central has a thread on this somewhere.

 

[guntech]

In the past when I did not have the correct filler screw, I used a drop of black epoxy and let it cure... easy to remove later.