My marking gauge did not work for the recessed half blind dovetails I was making so I made this one.
Marking Gauge.jpg
The blade was cut from a utility knife blade. Sharpen before cutting off. The blade is too hard to saw or file. Grind a shallow groove each surface and snap off with pliers.
The bar is 3/4" and the hole is 7/8". Note the two pieces of 1/4" dowel the bar bears against.
Works fine for the limited need but if used a lot a strip of metal inlaid would be needed for the hex head bolt to bear against.
Here are the dovetails
Dovetails.jpg