Works as described, and is a very useful addon. I find that the 29mm motors are the most difficult to clean and the threads lock up more than any other size motors (38, 54, 75mm). Having this saves a lot of heartache.

Aerotech has apparently redesigned this, and it is now a cheap 3D printed plastic square instead of metal. Function wise, it works but could have been much better designed, especially with being 3D printed. The fit is okay, but the finish is very pour quality. Very rough and uneven. Overall, the quality is much lower than what I would have expected out of Aerotech.

Picture shown is metal, however they must have not had any and received a 3D printed one. I could have made one myself for maybe 50 cents.