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That was in fact one of the first things I thought of Justin, so I have rebalanced it when suffering this problem. Made no difference. I then got a spring balance and artificially unbalanced it whilst tracking [and
cracking] by amounts up to 5KG both with and against the drive, and apart from hearing the motor working harder, nothing changed. Put the weights the other side, and all is fine. I'm mystified. As I said to Jim, I might have to strip it right down.
Until this arose it would track on either side o.k. without needing rebalancing.
raymo
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