Another bright side to the design is it affords you much practice, when replacing the AC belt, especially if you've decided to use an aftermarket "close size" belt. You get to loosen and tighten the sheaves multiple times to arrive at a decision about how many shims it will need this time.
After an hour you know just how many turns to take each nut and bolt on each succeeding rotation of the crank as it walks the belt out in the v-groove.
The first time I attempted this, I was not happy with the tension-- loose with x shims and too tight with x-1 shims, so I scissored a shim out of .015 brass stock for the x-0.5 happy medium. I'm no longer that fussy with it.
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Art Benstein near Baltimore
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