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I cannot see the u-tube here, but an impact will allow you to zip the pulley nut off.
A couple notes:
-It's NOT recommended to use an impact on that shaft. Tread lightly here. If you want to avoid disassembly of the blower snout, an impact is going to probably be your only option.
-If it's turning on the shaft freely, my guess is there was no key installed to begin with- accidents happen... If that's the case, you may luck out and be able to just install the key and reassemble... Perhaps you would need a new pulley and hopefully not need a new shaft??
Good luck,
Phil
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