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Go to home depot and buy either a dead bolt or Has anyone ever seen the old Mr. Bead on public TV, his car had a master lock with a latch!
PS i am just kidding, you might want to scour the junk yars to loof for a jeep or any vehicle with a flat door pannel, cut out both sides, weld them to your door, get a locking latching mechanism and interior handle, and change the tumblers[addsig]