Making friends with a shaper

[Hawkeye]

These are the holders that were made for my Lewis shaper. The Lewis was only sold as a casting kit, in two levels of pre-work, so all accessories were made by the finisher.
   
   

As you can see, the holder slips into the clapper from behind, same as the lantern toolholder, and is clamped by the big nut. The hex flats on the shafts will aid in this tightening. The short holder has two setscrews, while the long one is a collet type, with sawcuts to form the jaws. Both take the 1/2" boring bar, which is sized for 1/4" HSS bits.

This should give you a few ideas to make toolholders to suit your shaper.