Microjig Inlay

This is an addition to the Microjig Gripper Clone (https://www.thingiverse.com/thing:683535)

I built one for myself and had the problem that the screws on the adjustable middle part were just spinning, so I was not able to tighten them properly.
As a solution, I designed this part that fits into the track and holds an m3 screw head(hexagonal to make sure it actually has grip).

I have also attached the ipt file, in case you want to redesign it.