Screw Hole Finders (M3-M10)

Used to precisely locate holes on the back of material.  Screw one of these into a bolt hole, press the material against it and it'll leave an indentation that you can then use to drill a hole.

Alternatively you could do the same thing by shaving the head off of a normal bolt, but I was curious if this would work and it did, at least with PC.

I printed these point down with supports.  The point got slightly messed up and I just sanded it back to a perfect point.