Does anyone here use a woven rope guitar strap like the one pictured (taken from Ebay) below? I am thinking of purchasing a couple from Folkway Music http://www.folkwaymusic.com/merchandise/id.4/ or making some out of curtain rope, and would like to know how people go about attaching them to their guitars. Do you just tie a knotted loop around the headstock and strap button, or is some sort of slip knot or the like used?