In the mean time, while we wait for the diff covers, I have been using a home made lexan cover, that fixes to the screws holding the rear battery posts in, and goes up, round the transmission housing, and goes up through the top deck aswell. Nothing will be getting past it, as it only has small cut outs for the belt to run through, and my pulleys are nice and clean
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Ill post a picture later, but its easy to do with a bit of lexan from an old undertray or cutoff from a bodyshell.