AR XA Stylus Overhang
Scanned it at 1:1 but it was larger on the screen than in real life, which is why the ruler is included in the pic.
Print it and see if it’s right. You can then cut it out and use it. Punch out the hole that goes over the spindle, point the “point” where the arm pivots and the stylus tip should line up on the bullseye opposite the spindle hole.