Yeah! X2 Try getting a close up of the surfaces of the break from both parts. I'm real curious to see the broken area around the hole (passage) where the pin retaining screw goes.You might be able to tell where the failure originated based on the fracture surfaces. What you are looking for is a change in the "texture" on the fracture face. Most of it will be dull dimples (like little micro mountians and valleys) but take a good look for area(s) that transition into a smooth surface with parallel ripples - looks like ripples in the sand on a beach after the tide has been going out. The dull dimples are tensile overload, the beach marks or thumbnail marks are fatigue - where a crack has started and grown over time.
Post up some pics of the fracture surfaces if you find anything.
Seems like hitting something would have cracked the bottom pin area, not the top.not too sure, i busted a scagg off the intake plate about 5 years ago when i ran over a log, so im thinking it couldve cracked then, and after time it finally gave out.