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Bob Engelhardt

wrote:
The shear pin on the TOP of the engine gives minimal protection to
the shaft on the BOTTOM of the engine. By shearing at the flywheel end
it shuts the engine off immediately upon hitting something - limiting
the amount of damage it will do to the crank - but certainly not
eliminating damage.
[snip]

I think that's right. Except the crank is already garbage & shutting
off is probably to prevent collateral damage. And to keep the
operator's underwear clean G.

Bob