Thank you for replying. When loosening the red bolt the motor does not move to loosen belt. Just a piss poor design. So I'm stuck using one speed. I went to Home Depot where I bought it and ask the sales guy if he knew how to adjust belt. He had no idea. Just figures, you sell it but have no knowledge on how to help the customers who use it. If anyone else has any ideas how to loosen belt I'd be grateful
Cheers!