Plastic Servo Horn
No
Aluminium Servo Horn
Yes
Ball Cup Issues
No
Ball Cup Mod
No
Revised Ball Cups
Yes
Note: I've never had a revised ball cup pop off until yesterday when I told someone I didn't have problems with the revised ball cups popping off. I put the car on the track, grazed a pipe as I was going about 1/8 speed to head to the starting grid and off it came.
No problems before or since then though - so the first rule of ball cup issues is to not talk about ball cup issues.