Ref the tensioner turnbuckle. Ellis originally pointed out to me that when getting to the correct tighness the screw(ball end) that goes into the tensioner bar actually bends slightly rather than adds tension due to the resistance of the tensioned belt.
So I still use it and take pop the slipper out (to take the tension off the belt), change the tension a bit and refit. Without the tension on the belt the screw doesn't bend and so the idea works perfectly.
Now this might sounds like a lot of work, but I personally change my belt tension so infrequently that it's not an issue.
Personally I run the XXX4 longer belt, not sure if this really helps reduce skip but as I still run the dual pulley from a while back, that's the belt I need. If you don't have/want the dual pulley then you can file the tensioner slots back say 5mm, which takes up the extra belt length.
The machined pulleys are very good, but I ran the stock diff pulleys and xx4 centre pulley for nearly the whole time I've ran an X5 and I have little/no skip and a free drivetrain.
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