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When we arrived at Cobra Restorers, tech Patrick Kelley had already installed the fitting for the oil drain line in Steven's aluminum Cobra oil pan. Paxton's instructions detail how to punch a hole in standard sheetmetal oil pans for the fitting, but for the aluminum, Patrick pulled the pan for drilling and tapping. In either case, take care to prevent shavings, paint chips, and other debris from falling into the pan. Paxton provides detailed instructions.