Drilling Spot Welds, What do you use? Options

[obscurity]

I have been drilling spot welds as I work on my car and it occured to me that there may be a better way (or maybe I am being to picky). I am curious what everyone else uses.

I have been using a spot weld cutter. It looks like a short drill bit with a pilot point and little cutters along the edge. It will cut through the top layer or steel but not the back layer (usually). They will cut about 10 welds before being hoplessly dull. When I was buying them at $5/bit it was fine but that company went out of business and the ones I find now are $25/bit. Are these the right tools to use or should I be just using a drill bit allthe way through the weld.

Any help or tool suggestions would be appreciated. (IMG:style_emoticons/default/smile.gif)

Thanks,
John W.

[charliew]

My experience with the hole saw spotweld cutter is it leaves the center still stuck to the bottom piece and you still gotta grind the saved piece clean, but it doesusually cut faster. Also it seems to me like a spot weld is harder than the surrounding metal, a dimple makes it stay in the exact spot you want to cut. I also use the cutters that are reversable with cutting oil but I also use a carbide cutter in a air tool sometimes also. I always end up using a chisel either by hand or in the air tool to peel the top piece off though. I don't remember ever not needing to go back with at least a sanding disk to clean the saved piece up. Be sure and really hold on to a grinder or sander when you are in a tight spot, your nose is not metal.