It is late at night here and I'm tired so I can't check out the technicalities, but engineering wise I would trust Chuck with my life.So he is giving good advice, but when you think of what the pins do they are nothing more than a pin punch.So what ever the engineering spec. is for pin punches should suffice.Bushes made from Grade 8 capscrews will last longer than the Titanic, but that was only a week despite assurances it was indestructable.