NJW
Well-Known Member
- Reaction score
- 1,011
- Location
- Deux-Sèvres, France
You do have the machine in front of you, I presume? It should be very apparent just looking, perhaps with a magnifier of some sort. If there's a security pin up the middle of the recess, it will come right to the top, flush with the top surface of the screw thread. You shouldn't have to hunt for it.Too hard to tell if it's a shallow hole or the bottom of a normal screw.