When I made my pillar and clamp on toolholder style QCTP, the parting toolholders looked like the attached picture (at least I hope it's attached!) This was for a mini lathe, a Sieg C3, so it runs "backwards" ...clockwise looking from the tailstock. They have worked very well, the blades are A. R. Warner 0.04" and 1/16" from LMS. Routinely part off Al. Alloy at 800 or 900 rpm, steel at 400 rpm.
cheers
bp