Just a quick question to all that have had a wire saw snap,are you using them wih your fingers or wood in the rings?
The most efficient way to use them is like a bow saw,use a piece of hazel or similar and hook the rings onto the ends secured by grooves cut into the hazel.This reduces the angle of the wire at the point of contact to 0 degrees rather than the acute angle that is invariably used when just using fingers or timber in the rings.If you use your fingers you tend to apply too much tension to the saw,this combined with heat generated and an acute angle results in a work hardened piece of wire being overstressed and breaking.Let the saw do the work,you wouldn't put all your weight onto a bowsaw or panel saw,there is no need to do it on a wire saw either.