This is a photo of a quickchange toolpost I built.
It was designed to fit my 6" Atlas but after starting it I 
bought a 10" Logan. I made a second to fit it and it works quite well.

The toolholders are located by two 60 deg angled surfaces, and clamped to the
block with a tee nut.
The tee nuts are drawn up with a 5/16 threaded rod. the rods cross each other 
so their holes are drilled 1/8" above and 1/8" below the center line of the block 
and a flat is cut on each rod. This allows them to pass each other and keeps them
 from rotating.

Paul K. Dickman 

PKD_Toolpost.txt
PKD_Toolpost.jpg