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There is a support brace that's part of the rear hatch that is replaced by a removable panel in the hatch that has the lock as a separate cylinder. I've already source another hatch w/ a lock as well as the window that opens. I'm on my way to a solution.It must be the rear wiper that may cause problems with the lock. Can you not pull the rear panel and modify a rod and drill a small hole in the panel and at least lock it from the inside? Just a thought.