Bob Branson
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Replacing 1500 wheel cylinders, I noticed after-market bleed screws were 10mm, so I switched them for the originals (7/16".) Vacuum bleeder just kept drawing air, and I finally located one of the aftermarket screws for comparison. Different angle on the cone, and the BMC part has a tiny pin at the end to close off the drilled port. Happily, it looks like Moss replacements are the same Asian-made one I threw away. As John Wayne said, "Life's tough. It's tougher when you're stupid!"