I affixed cloth tape to my bore gauge, then covered it with clear packing tape.
As Tom observed, it is very easy to feel the end of the chamber - forcing cone juncture, and much more accurate than the simple rule gauges. It also helps document the location of a bulge or deep pit.

[Linked Image from photos.smugmug.com]

I did the same thing on my Henry wall thickness gauge, and it helps document the exact location of a thin spot or pit.

[Linked Image from photos.smugmug.com]

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