My friend took some burlap fabric, and cut out multiple circles to match his pattern until he reached the proper thickness. He then cut out the bolt holes and lightly coated each piece with tar. He placed a washer over the holes on every other sheet. Once the right thickness was reached again he placed it on a piece of plywood, put another piece on top and parked his truck on it overnight. It’s been five years and it still is holding together, although I might be changing it out next year. It took some time but, it looks original.