I hope you won Rob!
The pulley looks to be 5/8' already. It's nice the chain is lubed up.
You don't have to change the upper arms. I've ran with straight arms for 23 years. It just limits how high you can lift the blower. That only effects backing up in deep snow. With good weight and chains it's not an issue. Most of the time you will back over areas that have already been cleared.
PeterJ
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1863 48" deck, 3pt
1864 x 2, 54" deck, power bagger, 48” deck
1811 44" deck 1210 44"deck
IH trip plow
QA42-A, 451 x 2, 551
42" Earthcavator
Driveway Drag
USAF
Shepherd's Chapel
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