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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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