Needed a pin wrench/spanner to tighten the nut holding the disc on an angle grinder. I used M4 screws tightened through inset nuts as the pins. : r/functionalprint
ADJ PIN FACE SPANNER 7-40 2MM PIN
SPA-2 Pin Spanner | Park Tool
Need Some Help: looking for a small "pin wrench" - PentaxForums.com