You have to remove the retainer metal piece from the dash. Clean the black foam from both sides. Lay the retainer on a 2x4. you will have to drill holes for the tabs. I used the two part epoxy. Clamp the wood piece to the retainer. Line them up well and centered. Make sure you dont scratch the finish of the wood. I used magic eraser foam to protect the finish from the clamps. Remove excess glue before it dries.

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'85 300D Cal 280,000 miles
'14 GLK 350 60000 miles