The tiny bit of play reduces the fatigue that leads to breakage from the repeated small shock loads to almost zero without any noticeable wear on other parts.
While still being there to protect things from the big whoops moments.
Bolt long enough that the threaded portion is not in the shear area then using a nylock style nut tighten the nut up to seat the bolt then back it off a half turn or so, just enough that you can rotate the bolt with your fingers.
A couple of normal nuts jam locked together on the bolt will accomplish the same thing.
The shear pin on many outboard motor propellers are set up as a full floationg design.
I have never had one break under normal use. If the prop hits something substantial (abnormal use) the pin does it's job and shears off.
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
... [Read Article]
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