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
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