Hi Mike , as Billy said you need to clarify which end you're referring to ,I think you are talking about the nut which is part of the clutch arm adjustment . To confirm; if you have removed the small oval cover ,held by 2 screws ,the nut would be looking right at you, on the part of the arm that pushes the pushrod through the mainshaft to "lift " the clutch . It does appear big thats because there is a slot for a screwdriver in the end of the adjuster on to which the nut fits , you loosen the nut and adjust the actuating arm so that its pararell with the case when the clutch lever is pulled to the bar and the clutch is in the disengaged position ie lifted. IF you can't see any thread to screw it onto its in to far and possibly the pushrod is slightly to short ,cure could be pull out pushrod through the adjuster ,cut pushrod in half and insert one half and then a ball bearing and the other half of pushrod that could solve it ,oh harden the ends of the pushrod . There should also be a ball in the end of the adjusting screw where it bears on the pushrod ,you'll see an indent in the ends of the pushrod and there should be one in the presure plate as well . Do you have adjusters on the handle bar lever or just the gearbox ends ? I have both which makes doing routine adjustment quite easy ,even whilst riding and finally don't forget to have a bit of slack in the cable when its at rest. Hope that helps regards BobH.