ORIGINAL: Roskoe
I don't know if all replacement strings come pre twisted; but the Winner's Choice and Gibblet strings I have used were both already twisted at the rate of about one twist per every 2" or so. I'm assuming from some of the responses here that some replacement strings come untwisted?
Well, I'll tell ya what Roskoe. If strings come NOT twisted then they better be made between 1/4" and 1/2' longer than they shoulod be in finished form on the bow. I'm certain that string makers like Gibblet make the string longer and twist it down before prestretching it. They may stretch it before twisting. Also, they are twisted to finished length and put under pressure when applying the serving, too. This is what helps the serving not move or separate.
These are a couple of differences between good aftermarket strings and crappy factory strings. Take a look at how many twists are in many low end entry level bows. Hardly any. They are just thrown together to hold the bow parts in one piece.