Schaller Security S-Locks Pin Set M BC

All my guitars are equiped with straplocks, mostly by Schaller. The S-lock have a really nice fit of the lock to the pin. This eliminates the rattle that the originals have.
The Only issue withe these is that somehow the hex slot on the pins are inconsistent and mostly too large side. This is my third set that has this issue. A 3mm Hex key will sit rather loosely in the socket. So, if you try to tighten them down you risk rounding them out. A 1/8 inch hex key is a tight fit but works better. However, not everyone has US sized tools and it's clearly advertised as 3mm. At ~6 euros per screw (!!) that's an unacceptable flaw.