on some but not all compound xbows. 1st off, this will only work on solid limb designs like most of the Hortons I've seen, and will not work on my Paradox or the split limb designs like B-nett Quads. I came up w/ this last spring, showed it to Randy, aka 10 pt and since I can't sell it, lol, i'm giving it away! A guy in Italy that goes by Matthias 72 posted a pic somewhere, but I can't find it. What you do is get two pieces of aluminum long enough to span your limb width, drill a hole in the middle big enough to put a stout cord thru, cock your bow and put the two pieces outside of the slot in limb for wheels. Tighten the string, uncock the bow, gently and carefully, remove and replace your string. you may have timing issues to contend w/ but this will get you by if you are a long way from a press.