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yes you could roll the bar around the wheel, can't think of an instance where that would be needed though. Bit like one of those window winders I guess.
Climbing a worm round a wheel? I think tractor diffs are a bit similar to that. Though the worm is hobbed at 45 degrees and tapered a bit! No that drives in the other direction doesn't it? Reckon if you tied the wheels down, your tractor would rotate round the wheels - that's the effect.
Still and all, the gears will always work, just can't really find a reason for it to be made that way though.
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