12pcs M8 Clevis Pin and M3 X 60 R Shape Cotter Pin Assortment Kit, 304 Stainless Steel Single Hole Flat Head Pin Cotter Pin Hairpin for Hitch Pin Lock Systems : Amazon.co.uk:
Cotter Pins
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PIN FASTENERS: THE ULTIMATE GUIDE
Cotter Pins - Fasteners - Configure and purchase | MISUMI
0.091" x 2.000" Hair Pin Cotter - HAIR-6-S - Pivot Point
Split pin - Wikipedia
Is this alright instead of a cotter pin or too sketchy? : r/Dualsport