Would say, be careful to run with 511 at all on tracks with small stones.
I have ruined several pulleys and belts running without covers.
They get stuck between pulley and rear suspension mount.
Short diff covers give some protection, but as I have said before, not sufficient protection on those kind of tracks.
You will need long diff covers to get proper protection on tracks with small stones.
Might do a revised long diff cover for conversion set.
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