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You will need a 21 mm wrench or socket and a large screwdriver. You will notice two slots on the inner half of the pulley located 180 degrees apart. Insert the screwdriver into the slot to hold the pulley while undoing the 21 mm nut. There are shims located between the pulley halves used to adjust the gap between them which adjusts the belt tension. More shims loosens the belt tension and less shims tightens it up.

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10y ago
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