I need a better spotweld cutter. I have the cheap Napa one. It's alright, but it tends to jump around alot, even when using a marking punch. I have been looking at both the Eastwood "no walk" or whatever it's called, the one that has the small bit in the middle to make a "pilot hole" so it can't walk around, and the cobalt ones that have a point in the middle to cut first and then the bit cuts the spot weld instead of the outside ring like the eastwood. Which should I get? Thanks for the input.