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			Correct, a doubled string and pouch will be necessary.  You might want to locate Helmut Nickel's article, "Stone-bows in the Old and New Worlds" in ARMS AND ARMOR ANNUAL (ed. Rob't Held, Chicago:  Follett 1973), which shows examples from several cultures and from these you can get a good idea as to the various ways that a functional version can be made for your crossbow.
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