It is slipping to one side because the pulley on the end is not aligned correctly
on the adjuster arm that holds the front pulley there is a lever or knob that you use to adjust alignment ( instructions in user manual) find that adjustment and slowly move it while the belt is running
you will see the belt running position change to you get it properly aligned
each belt regardless of ryobi or generic will need adjustment after fitting
Testimonial: "thanks to Bill Boyd I knew answer would be simple I was using the knob as a belt tightening as I was told that's what it was for lol"
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