Scout drive upgrade

I've had some expensive tables and am back to a humble, stock Scout, which I think is an amazing performer when properly isolated and given a good cart & phono preamp.

I've been listening to it for about six months now and the only thing that does occasionally intrude on my listening is it's noticeably non-exemplary speed stability. Looking at the rubber belt drive, it seems to me that must be a weak point.

I would appreciate suggestions on improving the drive system, either by using a different belt or possibly a total replacement (rim)?