I made some teenuts and work stops out of mild steel.  These are sized for 3/8" slots (threaded 5/16"-18 tpi) for my 8" Logan shaper and Hardinge TM mill.  I used 3/4" A36 square stock, cut the profiles on the shaper, then drilled and tapped or counterbored, then sawed apart on my cheapo bandsaw.  I finished the ends of the workstops by clamping all of them in the shaper vise at the same time.