I've had a 501 and a 511, never had the pulleys wear out, I run the belts slightly loser than the manual suggests though.
I usually gauge the belt tension by how much movement is in the top front/rear belt. if you can play a tune on it its too tight; i usually set it so that you can lift the belt about 15/20mm from top deck without stretching/forcing it.
never had a belt fail or skip or ruined a set of pulleys..
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Mike Baldwin - Caldicot
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