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The old doorskin still has tabs welded to the doorframe, and those welds need to be drilled out with a sheetmetal hole cutter kit. These bits have a central guide pin that centers on a dimple that you’ve made prior to drilling out the weld. The Nova has four of these welds—two on each frame tab. After drilling them out, pry away the remaining doorskin tab to reveal the bare doorframe tab.