lightproof door, enlarger setup

I would welcome any ideas to lightproof a door for a basement darkroom. It's a standard 36" x 80" pre-hung interior door.

Also, I have an old Omega D enlarger that I need to setup. There are adjustments on the enlarger to "focus" all four corners of an image. Any advice on the best way to do this? Would I just use a grain focusser to do this?

Thanks.

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