I have 5-6 inches free pedal before clutch engages. Operators manual states to loosen clutch adjustment lock nut and turn adjusting bolt counter clockwise to reduce free pedal to around 1 inch. Had to use lock pliers to turn adjustment did so until it stopped. Still had too much free pedal. When I started tractor cltch housing was making mechanical noise and vibrating to pedal. Immediately shut off tractor and turned adjustment clockwise back to initial setting. Clutch engages fine but near top of pedal travel. Just got tractor and all else is very good. Is there a replacement clutch nut and adjustment screw that I can install externally or are there other issues that I may need to address. Sorry for the long winded explanation as I am just getting into owning classic JD?s.