Anybody build Flemish twist using 8190?
Yes, mostly Flemish Twist, but I don't think that really matters as far as serving material. At least, it doesn't the way I make my Flemish Twists. I back twist such that the bundles have no twists among themselves through the body of the string. Some strings I've seen, it's like you've got a two bundle string all the way through, and the serving just squeezes it round in the middle.
I am beginning to think that I serve tighter than most, because a lot of the suggested combinations I have no doubt work for somebody, but I've used thicker for the same results.
Really, my recipe, is to serve on a little bit for a given nock, see how it fits, and then try again with something else if I need a change in nock fit. Rick Barbee's suggestion of padding with Teflon tape can help, though only so much, as the serving will push that stuff out of the way.
I think, if I recall correctly, for 14 strands of B-50, I used .021 or so for an S-nock, and for 20 strands of 8190, .026 diameter Diamond back, or .025 #62, or .024 Halo, or something like that, but my memory isn't exact that way, because as I said, I usually try and see...