My GSO Crayford focuser broke, and the TSRPN2 replacement didn’t match my telescope’s existing holes. The official TSNB230-G2 plate was expensive, so I modeled my Newtonian in Fusion and made an adapter plate. It bolts to the current 4 holes (70×73 mm) and marks the new ones for the TSRPN2 (55×90 mm). Drilling went perfectly, and I could collimate the Newtonian without any problems.

This was inspired by a spider design from Backyard Universe, but the price was too high for what it is. I also came across a parametric spider on Printables, which gave me the idea to build something similar myself in Fusion. I kept the proportions close to the stock spider so it would fit without major changes. Using PET-CF and thicker walls made it much more rigid, and adding M4 inserts gives it a solid mounting. I also flocked the inside of the tube and the spider vanes to reduce reflections.

I initially tried using a Celestron C9 dew shield as a light baffle, but it introduced heavy vignetting because it was too long. Instead of guessing, I worked out the maximum usable length for my setup and ended up at 10 cm. From there, I designed a custom piece that mounts directly to the existing holes on my telescope. The plan is to paint the outside matte black and add flocking on the inside.