this is a whipped nock point (not a knot) using large diameter .025" bcy #62 braid black/white serving. the actual center serving is .019" bcy halo.
use unwaxed thread (center serving type) and never any waxed thread (bowstring fiber or dental floss) as the wax inhibits the capillary flow of the binding agent (quality model shop thin cya such as 'hot stuff').
serve the nocking point with just a few turns, whipping the tag end back under the nock serving. pull the tag end *tight* and leave it hanging.
liberally saturate with water thin cya. when the cya has cured, use a razor blade/knife to trim off the hardened tag end. give the entire nock point one more light coat of cya.
the result is a hard and ultra light nock point that will last the life of the string and not harm your leather glove or tab.
note: this type of nock point can't be moved, it's permanent. it can be removed by cutting off with a razor blade/knife. use knots instead of serving if you need to move the nock point.