I've flipped the covers over, laid the lip against a workbench, and hit the bolt holes with the ball end of a ball-peen hammer for decades. Works in a flash for trans pans, oil pans, valve covers, what have you. Very simple, very effective. Never had to resort to boards or presses or studs or anything else. Late to post here, by a bunch, but for future reference.......
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Jeff 
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