I wouldn't use leather because it is to heavy. I would use silk thread or some kind of full length backing like rawhide or sinew. Maybe even a hickory backing. Being in IL. you may not get the best performane from hickory because of the humidity here in the midwest. I would fix it with silk or a full backing, but thats just me. I know the last bow I had that developed an issue I origionaly wrapped with epoxy and high performance, zero creep bowstring, but was never happy so I pulled it off and sinewed the whole bow ( it was only 58in. ) and am finally happy with it. Whatever you do show us with pictures and ask questions.