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Has it always wandered a bit.
It could be the basic grinder design. There's some thought that when the tracking wheel is on the uphill side of the belt direction, that pressure on the belt at the contact wheel or platen causes a decrease in belt tension on the uphill side, against the tracking wheel. On the downhill side, the tension is supposed to increase because the drive wheel is pulling on the belt, and the work is resisting.
I believe that's why the TW-90 Wuertz grinder tracks with the drive wheel. I didn't think it would make much of a difference, but the little that I've seen of a Wuertz grinder in action seems to show that the concept has some good thought and results to show for it. I'm not the biggest fan of this particular grinder, but it is very smooth.
Only thoughts if everything else is in decent shape, Craig
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