They all have a bit of a wobble to them. N20 are even worse but N20 uses a different belt from Gates.
I wonder if it is worth flipping the belt? Or giving the balancer a bit of a shave with some sandpaper? It's not rare for a belt to be a bit uneven on the edges.
Of course, if your balancer actually wobbles more than 'normal', you may have no choice but to replace it. It's a very expensive part though
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