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Another tip I forgot too mention, when removing the spotwelds I take small worn down cut off wheels and grind directly at the spotwelds almost to the point of grinding off the old rusted sheetmetal, but not exposing the underlying steel. I find this weakens the spotweld much better and almost "pops" right off with little pressure as to not destroy or mangel the steel you want to weld to. I find that using the spot weld cutters (mini hole saw) that 9 out of 10 times you don't always catch the whole weld making it very hard to break apart, then really making a mess out of the underlying steel.
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