cannot get the running belt to stay in the middle, keeps going to the left and is damaging itself, i did loosen the belt with allen wrench as per instructions to lubricate belt but it just wont go back to how it was and stay in the middle, i have tightened the bolts as far as i can

sheryl bell, February 2013

The 2 rollers are not exactly parallel.
If it keeps going to the left then the gap between the rollers is smaller on the left hand side (or conversly it is wider on the right hand side
Start by slackening the bolts for the top roller, then nip them up. Do the same for the bottom roller. If they are not parallel now, you need to do some trial and error adjustments

GB in Wales, February 2013