I was having a similar problem; found the solution with a Saunders Kiss-XL -----> [align=right]http://www.sausa.com/Kiss-XL_.jpg[/align]


Starting above the button, I stitched the serving thread through a hole, wrap around the bowstring, back up through another hole, around the string, down through another hole, etc etc (you probably get the idea). Finished it off with a few dabs of cement on the threads. Hundreds and hundreds of shots with this set up and still 100% intact.