I recently checked out Arrowind's fine Burlap Backed Ash bow, and remembered a similar bow I made and set aside a few years ago for a grandson. So over the weekend I strung and 'exercised' the bow a few times. With every pull it was giving off a cracking sound. I was relieved to find it was just the backing moaning some and not the wood. I'm not sure if its the dried poly finish or the burlap loosening--it was applied with TBII as I recall, any ideas?