I have a set of full size doors (used 89 doors) on my 95 Jeep Wrangler, in which I want to paint. I have disassembled both doors, but I ran into a problem…one of the bolts for the upper support (mirror & upper hinge) broke off and was rusted in place. It broke off flush – so I had to drill it out. What solutions might you recommend to recreate a threaded hole for the bracket? The metal piece is supported-surrounded by a flange/support inside of the door.