I recently needed to make a slight adjustment to the angled part of a mitered dovetail. I opened the joint enough to get a mill file through it, and then applied a strip of blue tape to the side of the file that I didn’t want to cut. Next I inserted the file and pushed the joint against it. The tape let me trim just one side of the miter while maintaining the perfect angle, producing a flawless fit.
—ANDREW KOSIBA, Gloversville, N.Y.
Illustrations by Dan Thornton
From Fine Woodworking issue #292