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Just an idea. Not shure if it makes sense.
The plastic chain ramps tend to wear. Even if the chain tensioners work correctly, maybe this could cause not to get needed tension.
Also the chain tensioners tend to fatigue. Over here in germany there were some problems like this reported that could be fixed by replacing all tensioners at one time.
Shure, also the chains can be lengthened.
Regards
Markus
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