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Reply to "Descriptions on maps"

I'd be interested in comparing notes regarding making permanent marks in concrete pavement.

The calibration course near the finish line of the Chicago Marathon is set on a concrete sidewalk. The ends are marked with holes driled in the concrete in a cross pattern. When the paint on the ends of it fades, we all lay some more down so they'll be easier to spot.
It's an important course because it's used to calibrate for almost every measurement in or around the Chicago Loop; it wouldn't surprise me to find that it's used 20-25 times a year.

The course needs to be remeasured by the end of 2013 if it's going to remain certified, and I'd love to find a more elegant way to mark it. My thought is to drill a hole deep enough to accept the entire nail, then drill a larger concentric hole that would accept the head. I'd then drop a nail in the hole and secure it with epoxy. If I could get the nail head flush with or below the top of the sidewalk, I can't imagine the nail going anywhere.

Anybody have any experience with this or anything like it?
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