Geeze guys, why make such a bid deal out of this simple task? A fine tooth hack saw, a bit of tape and clamping the wire in a vise close to the cut works just fine. For all the different types of mechanical fittings I've used, having a perfect 90 degree cut is not important, and all the instructions I've read suggest using a file to round off or chamfer the edges of t he cut strands. The latter will be helpful in getting the strands to start crimping down around the cone.
I've used Sta-Lok, Norseman, Sea Rig and some un named one that came with a Reef-Rite furler
. They all worked well and none were very picky about the way you cut the wire.