I took off the wheel on my car and all I had to do was slide off the center pad, it just has a lip that goes over the metal base so just peal it off. Then look in the center and there is an allan screw, remove that and the wheel pops off by pulling it with your hands. I almost hit my self in the face with it because I thought it would be harder to get off and I hit it hard.

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1983 300SD
200000miles