Small Engine Repair 101 Redux ... Again
The new short block arrived. Here's the destroyed block and the new block side by each.

I reassembled the engine without difficulty except the engine manual has no specific instructions how to adjust the governor linkage. Not wanting to blow the engine again, I took it to Arvin and let the mech adjust it. Back home, I reassembled the chipper/shredder shrouds onto the engine. I've shredded the pile of leaves I'd started when it threw its rod and it runs like it did when it was new. I hope this "learning experience" is over.
N.B. Techumseh apparently acknowledged the flaw in this engine, that of the crankshaft running directly in a hole in the case. This short block has bronze bearings for both ends of the crankshaft. Let's hope it continues to run smoothly as long as I have brush piles to chip and leaf piles to shred.

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