Trakhak

I realize that it's an uncommon concept and a special case that many people never encounter. Still, ham-fisted bike mechanics I've taught in service departments who used to screw up cotter pin removal jobs quickly adopted my technique once they saw how effective it was.

They also appreciated being shown that it's far easier to snug up cranks onto square-taper bottom brackets by using a torque wrench on one side and a socket wrench on the other rather than using the torque wrench on each side in succession, although it sometimes took a while for them to understand why that method simultaneously tightened both bolts to exactly the same degree.