Why not just use a screw and nyloc nut? 4-40 x 3/8 should fit it.
www.mcmaster.com
91831A005 nyloc nut
91772A108 screw

What I do is to use a 0.093” plated thru hole and drive the 4-40 x ¼ screw into that. Too late here, but maybe next time.