Here is my 2c.
I made a platten that fit around the press clamp and is as wide as the bottom of my newmans, leaving the outside curve able to extend out about 1/2 inch (to catch the pins). I printed a clear film with just registration marks, a box for crest print and a few other lines and taped it down to the platten as my "guide"
Note the pegs sticking up on both sides of the clamp and one on the right side. I lightly tape (one sided) the film (with image) onto the registration film on the platten. Then I put two small strips of double sided tape on top of the film (back and front). Ease the screen with coating into the clamp area and up against the 3 pins. Press down on the screen mesh to catch the film and lift up.
Expose the screen and when ready to print, push the screen into the clamp box up with the 3 pins and tighten the clamp. Odds are pretty good you will have minimal if any "on press" registration adjustments to make.
P.S. The screen I put down in the pic is not a good example since it was a one color, but hopefully you get the overall idea.