Glen-
I use the anvil type that you showed and with a little modification they work a lot better on high tensile steel cable. Use a flat file and tidy up the cutting edge, don't reshape it, just clean it up. Then crank the adjustment screw down to add more pressure at full closer. Walla! They ain't perfect, but they work twice as well. I use the 18volt dewalt recipocating saw for the bolts.
Brian