spurgear - i have 2 NTC3's and they both did that. here is a solution

the problem is caused by two seperate parts.

1st - the bellcrank bushings are too loose and need to be replaced with bearings. AE makes this upgrade and it can be found anywhere.
2nd - ur right about the ball cups. replace them with a set from RPM similar to the rear toe in ball cups. these will solve the problem