Product Review (submitted on March 9, 2021):
I use the “Integrated Drive System“ for my x-act servos HV5101. I use it in my F5J gliders.
So far I have used the “Integrated Drive System“ from the company "Servorahmen.de". Unfortunately they don't fit x-act servos.
The new FrSky “Integrated Drive System“ is very good. It’s includes a very well-fitting and stable servo frame, different sizes of servo arms, ball bearings, and a large number of push rods.