I don't have any MTH modern Lionel tin-plate but I do have a lot of prewar tinplate. To me the answer is to very slowly and gentle as possible, been the tabs up right. I get them as far as I can with a flat-head screw driver, then will finish straightening them with needle nose pliers ( sometimes this part is after they are apart to ensure easier putting back together. Also bending the tabs back down is best to do slowly and gentle also.
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