Originally posted by GrandeGixxer
i found a 4-40 but no metric ones.
mcmaster has it. part # 91732A773 (18-8 SS Standard Helical Insert M3-.50 Internal Thread, 6.0mm Length)
i re-tapped mine with #6-32 and it seems to work ok (need to enlarge the hole on the button head for the #6 screw to go through)