JFC, I use a digital caliper for the initial clutch nut setting and like Rookie Solara says you can get these digital calipers cheap on eBay these days.
Its well worth buying, I use it regularly even to check tyre diameters before a run, after a run to check for tyre wear on a particular track and also when I'm truing.
When building or rebuilding the car, I use it to check screw sizes and lengths. Most importantly, when you service your centax, you'll need it to check the internal diameters of the thrust bearing end washers.
GET ONE!
