Machinist/Gunsmith Homemade ball vise questions

[Stealthgeek]

Hey everyone, I am a Gunsmith and a Machinist who wants to learn engraving. I have the means to build my own vise but it would be nice to be able to have a vise that can use GRS jaws and accessories. My questions are can anybody provide me with the GRS vise jaw specs and or the specs for the pins and the plates that insert on top of the jaws? **Edit**(Standard Ball Vise Specs)
More specifically, the dimensions of the T at the bottom of the jaws, the thread size and pitch, the hole sizes and locations on the top of the jaws. Thanks for any info that everybody can provide; I've looked around and cant seem to find any solid info out there. I could just make the vise to my own specs but it would be nice to upgrade the jaws in the future.

Thanks again for any help.

 

[mitch]

thread is 1/2"-20 i may have T-slot dimensions around here somewhere, too.

 

[Stealthgeek]

thread is 1/2"-20 i may have T-slot dimensions around here somewhere, too.

Thank you sir!

 

[Stealthgeek]

Thanks for the info, if anybody else out there has anymore dimensions I would be grateful. I am ready to start my vise build and will hold off on the jaws section until it cant wait any longer. Thanks again for the help.