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I've used these... they are nice as they drill around the spot weld.... I have the double sided one... about $16 or so and about 10-15 for a pack of 3 blades.

My local paint store has them as well...

http://www.blairequipment.com/Spotweld_Cutters/Spotweld_Cutters.html

If all you are doing is spot welds the double sided spot weld cutter is great, Challenger125 kit has a bunch of different sizes, which you might not need...

RAR II



Good to know, paint store huh.