Double "T" nut

[mklotz]

This is reminiscent of my "movable-hole" device made for my milling table...

http://www.homemadetools.net/forum/m...essories-46449

The hole (which accepts a pivot pin) is drilled between the two tapped holes in the T-nut. Unlike conventional T-nuts, the tapped holes are tapped all the way through the nut. This allows me to use setscrews in the tapped holes to force the T-nut up against the underside of the T-slots to lock the nut and its hole in place. Naturally, one must exercise care when tightening the setscrews; too much pressure could damage the T-slot.

The hole could be tapped with a different thread than the setscrew holes if that is required; in my case it wasn't. Or, more simply, one of the two tapped holes could be a different thread from the one used to secure the nut in place. Many options are clearly possible.