This part has an improved tensioner design and allows more pulley teeth in mesh with the belt. This prevents belt skipping for very front-heavy scopes/lenses.
It also fastenes to the RA ring using recessed M3 nuts rather than threading M3 screws into the plastic part.
This shows the two idlers and belt without the cover that holds the two shaft and screws onto the two posts on the mount.
The part is in the repo in the STL/All Latitudes folder and is named
The parts you'll need are: