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 - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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