Folks: I found an old stick-bow at my summer place ... with no string. Nice piece of wood; needs new grip-wrap, but that should be a nice project. It's exactly 60-inches long, with very little curve at this point. My recollection is it was a 36-pounder. I'd like to get it up & running again so the grandkids could use it. Any idea what the proper string-length should be? Thanks, Peter F.