If you followed the good advice in the previous posts and the issue is still not resolved, then you will have to dig deeper. I know it's messy and a pain to have to take the forks apart again but it is a safety issue.

You say it is stuttering or juddering on compression but not rebound?

Remove wheel, mudguard and fork springs, and work each fork leg up and down. It could be just one leg that is stiff. But if both legs feel smooth in both directions with the wheel off, then apply a fore and aft sideload. If a leg then gets stiff, maybe one or both bushes are too loose. If still smooth, then it could be an alignment issue, as previous posters have commented on.

Hopefully you can sort things without dismantling. Let us know what more you discover and we can go on from there.

Dave

Just bought a New pair of sliders for a Manx. made up some 30% graphite Nylon bush's ..they feel silky smooth! there is very little stiction . But with plastic bush's they are pron to cold weather nipping
I machined the limits to plus two thou, it was seven degrees in the afternoon and the assembly was sweet, BUt after a overnight frost next morning they where stiff/tight, placing them in the sun soon had them smooth again. I think the slider had contracted the "yeiding" bush onto the stanchion.
Makes me wonder what plus 35 degees will do...i would guess LOOSE!