You use the two bolts that hold the step up pulley in place. The step up pulley is the pulley assembly that is closes to the back of the unit. The step up pulley slides into two grooves in the frame, then there is a bolt on each side that run down the groove into the step up pulley. These bolts are the bolts that adjust the tension for the skinny belt. You may need to loosen the other belt first then tighten the skinny then retighten the belt you replaced.
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