GRAFLEX Red Button and Glass Eye Thread SIZE/PITCH ?

[Ridire Fíréan]

Hey Gang!  Does anyone know what the GRAFLEX Red Button and Glass Eye thread size/pitch is?

I need to buy a tap to adapt a Red Button to a GRAFLEX style TCSS MHS Blade holder but I'm having difficulty finding the info on the threading.

Just to be lightsaber crystal clear, I'm trying to adapt a working GRAFLEX Red Button by drilling out the whole and tapping it so that I can screw the button into the blade holder and wire it to be a functioning aux button.  I'm not looking for the 10-32 threading of a Red Button Thumbscrew as that's already drilled and tapped there from TCSS.

If anyone knows the answer, please let me know what it is.

[ARKM]

It's 5/8-24.

[Ridire Fíréan]

Thanks here too @ARKM  !  I really appreciate the answer!  I found a tap online that I'll order if I can't find one locally tomorrow. 

Now I just have to figure out how to get the wires past the LED Module.