I think the dental drills they reference are the dental files -Which there are 5 on the Supertrooper. And while that dental piece is similar to the knee pieces it isn’t an exact match. I’ll see if I can find some older ones to match exactly
Those quick connects that Drax found look like check valves also. If they were taken apart at the check valve end (lower portion) and mounted with the hex end at the base of the JP, it would look pretty close to what you have Hawk... By the way Hawk, your pieces look really good !!
The red thing is a magnetic drill bit holder I got off eBay. I cut the base off of it which is a pain since trying to hold the thing with out damaging it is tough .