@adubeau you're welcome. Sorry the link I gave went back further (in that thread) than I intended.
When I set mine up, I used shim stock to maintain a small, even gap between the turret knob and the surface that it can bottom out on (when the zero stop pins touch).
When you get yours, you may have to crank it to zero, then loosen the knob set screws, raise the knob a bit, tighten the set screws, now you can dial past zero (point of impact down). Rinse and repeat until you get to where you want to be (zeroed at 50yds), then set the knob aligned at zero (with maybe a .005" shim between the knob and scope body), then lock down the knob, and remove the shims. Now you will have a gap (that might not grind, unless it gets full of debris), and pin interference/stop at your zero.
Because of the design, I scrapped my dialing of close range hold under preference/habit, and figured out the high point distance of my projectile's flight, and zeroed there. Everything else from there (near or far) is elevation (dial POI up).....but my use is not consistent with most people's on here.
I'd offer to video or take more pics for you.....but I sold mine.