You might do better with quality split lock washers. And maybe use carbon steel rather than stainless allen head screw for the hot/cold exhaust cycle. I think the star lock washer is light duty stuff.
There is another type of lock washers called Nord-lock that's surprisingly better but I never tried it. Expensive
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Two 125's and a 124 all with 42" decks
Plow blade
#2 Cart
QA36 snowthower
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