I found 7 3/4 to 8 1/8 to work on the 4 I built. I have a friend build my strings, the quietist string so far is a 452X ,18 strands with the ends built up to 24 strands, using homemade wool silencers. Jeff made me several strings using various materials. I did not try them all, I have a FFplus string thats also fairly quiet. did you get the watusi horn bow started? I ran out of time on the longbow build, hunting season now bow building season later this year. i edited this after calling Jeff..