The belt pulling quickly to the center is the sign of the weaker spring and doesn't indicate a malfunction- just a quick upshift.There are not hard to turn by hand if the bushing is lubed,pre-load is clockwise to the nearest rubber or ramp(1/4"turn maybe). The hole placement provides for a very small adjustment in the return of the pulleys. I've always just loaded the spring in the center hole. If the pulleys don't retract it's more likely the bushing.I know if you pre-load past the second rubber it doesn't retract well.
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