| try to picture this: each groove on a belt needs to have a certain width to have traction on the pulley. If the v^v grooves on the belt itself are worn thin then the pulley peakes will bottom out in the valleys on the belt and not allow the belt to touch the surface of the pulley with the required pressure to prevent loss of traction. It's all about pressure and surface area, it's the main reason why all modern vehicles now have multi-groove belt design as oppose to your basic v-belt- lawn mower style single belt groove setup :)
*disclaimer*: all that I say may be true or I may be completely wrong and I accept that.... please, it is your duty as another person on the internet to tell me (in-politely) how wrong I am :) "The dreaded 2nd windshiled wiper swipe when you turn it off its almost like tis showing you that it's boss, and it doesn't have to stop when you tell it to :("-College Boy This is what happens when you leave your Z parked outside too long:
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