Finding N is twofold:
1. Loose clutch hub nut = Lever loses initial play at the lever upon constant adjustments.
2. Warp clutch plates = Hard to find N but lever never moves as if [adding more slack like a loose nut] would cause. Therefore, the nut is not the problem, the plates are in question. Note the two differences.
Clutch design of the pressure plate causes N loss:
A. When plates separate, the gap is so narrow, if a plate touches another plate, it creates tension against the dog gears and is hard to pull the dog out of the opposing gear. Why? It keeps tension on the friction plates to keep moving [the steels].
B. Place all steels onto each other. Look for air gaps that cause the metal to buckle and flex out of a flat position due to heat.
C. Plates have memory and need to be assembled in one direction. If for example you place palm against palm, notice how your fingers press into each other. Lay one palm over the back of the hand, bend fingers now. Notice how both fingers move in the same direction.
D. This says to install plates with cut edges facing you. When steels are stamped out of flat sheet metal, the sheer is round on one side of the steel plate, and a sharp edge is the other side. Note those directions on both friction and steels. This helps from indiscriminate assembly of plates in any old direction> which begins to cause a drag on the pack. Replace any warp plate to stop that next plate that keeps the dog from disengaging out of the other gear.
A pressure plate [design] can either be made as a steel type 'wave plate' or uses a flat designed pressure plate cast out of aluminum and machined flat on one side.
I. A wave plate needs to be pushed flat upon assembly. When the wave begins to concave, this too is like a warp kind of action where the plate cannot flex flat when the lever is pulled. Therefore, the next plate is [touching the other] which makes up the pack's (full length of compression). When the plate cannot flatten, there is no gap that separates the plates. That is why you need a visual so as to see a flat wave plate when all plates are assembled.
II. A flat [steel] pressure plate acts like an aluminum made plate. It has only the plates to [create a touch] as far as who is causing N to hang up? The wave plate would cause a drag if the wave is more concave than flat, or mimics the aluminum plate. This type pressure plate may not show any clutch plates to be wrinkled, but pleasantly worn out instead. This causes the wave plate to concave when the clutch is released/pulled in.
III. Eliminate either a steel friction plate warp, or a pressure plate wave out of spec, needing to be flat in other words. Note the different designed plate application on your bike. Find who is in need of proper assembly? Who is flat so as to find N like butter. Your pressure plate design is one address needing attention. Clear that warp, then address the many [steel] plates as per [direction]assembly. In other words, a steel friction can have both warp and wave of that pressure plated design, but an aluminum pressure plate has only the warp of the steels/frictions to blame as far as finding N much easier.
Make sense?