I'm going to try and make one using a large diameter impact socket by milling out 3 windows for the ears and filling the inside of sthe socket with Devcon so it will match the profile of the spinner. I don't think a 1/2" impact wrench will do it so I'm going to use a 3/4" drive.
We'll see how it works. I won't have my car for a couple more months, so patience is required
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