MemberSeptember 22, 2016 at 9:34 pm
The black stuff will probably just be aluminium oxide and house dust which will have been coating the nylon rollers, a few runs up and down with a wipe down with a damp cloth between runs will sort that out.
And the other problem sounds very much like you need some new batteries.
The drive mechanism is simply rack and pinion, the lift being clamped to the track by eight egg timer shaped rollers, four on top and four below.
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