The Greenfield clutch (drive belt) is adjusted by spring pressure pulling a long rod that has serations on it. Either the belt has run out of adjustment (= new belt needed) or the adjuster has stuck. Lift up the seat and push the adjusting rod that has a big spring attached to see if you can move it towards the front. Look at the pulley beside the rod, if the belt has stretched too far, the pulley will be hard up against its slot. The pulley moves towards the front to tighten the belt. I just push with my leg to get another "click" out of the adjusting rod. New belts are cheap too.
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