Best method I have found is to buy some center drills (Harbor Freight) then center drill all the spot weld you want to remove then buy a spot weld remover (Body Paint shop). Once you have a good center drill hole in the (middle of the) spot weld you can use the spot weld remover to drill out the spot weld. The trick is to clean the spot weld area real good so you can see what you're doing then use the center drill to put a hole as close as possible to the center of the spot weld. Once you have the center drilled hole in place you can use the spot weld remover to drill out the spot weld. This process requires a little patience!! Don't drill too fast (low speed) and you'll break the spot weld remover. Use some cutting fluid and your spot weld remover will last a long time. If you try and hurry you'll break the spot weld remover. I've disassembled a whole Mopar this way and sold all the parts individually.
Treblig
