Think those old tips will hold up to a FF string? Some guys have good luck with it, others have broken bows with the vintage stuff.
I shoot my selfbows with no stretch material padded at the tips. However some of those old bows don't have tips designed as well as my selfbows. I wouldn't use a thin endless loop with a hard serving but I wouldn't fear a good flemish twist padded well at the tips. Just use at least 9 grains per pound of arrow weight on those older bows. I would be more concerned about a too light arrow than a good non stretch string.
