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I think I figured out what the problem is. The end caps of the gear outer were in the adjuster tight, so they couldnt twist relative to the adjuster. So when I adjusted tension with them, it was putting in a twisting preload, thus unwinding itself later on.
Fixed it with some thin alloy end caps. Fingers crossed it stays put now.
Hovis
When you say unwind, you mean gets shorter?
Sounds like it's faulty, I've got a couple of exactly the same model that don't.