A while ago: http://nika.frontier.iarc.uaf.edu/~cswingle/archive/get.ph-
tml?message_id=103919#message (holy passage of time, Batman - it was
over a year ago!)

I made a cutting gauge. But it's got a problem. The wedge doesn't hold.
I've fancied up the fit and finish, but the blade still slips out in
use. I'm starting to think the angle's too steep.

Does anyone have a cutting gauge, with a brass retaining wedge that
holds nicely, and could measure the engle for me?

Then I'll fix up my gauge.#

I'll square up the mortise (currently tapered), fit a patch piece, and
then cut a new mortise at the new angle. Meanwhile, the old brass wedge
will be filed down.

Yeah, I could make a new one (marking gauges for conversion are cheap),
but I can't bear trashing a salvageable tool.

       BugBear

(who also made a cutting gauge with a machine screw blade holder, which
works, but is less pretty than a brass wedge)