Tip: To get the calipers over the raised "lip" at the edge of the disc problem.

You can use regular calipers instead of micrometer, by grabbing a couple of common washers and hold one to each side of the disc and caliper that thickness. If you zero your caliper on the 2 washers alone, you don't even have to do any math to subtract the thickness of the washers to arrive at the disc thickness.

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Cheers!
Scott McPhee

1987 300D