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If your shop is like mine, I'd have bubbles on me if I were to stay out there during the "warmer" parts of the day...it's 106F here now. My little ac unit in the shop can't even keep up in this...

I have a 4 x 36 myself. I get my belts (norton) at Home Depot. You say bubbles...do you mean a ridge down the center? That could be the tension is too tight. Either way, I had some things simular...