+1 with Jeff and Kruser. I'll add something. After many flights, the mSR's flybar wears against the main shaft. You can tell if this is happening by looking at the shaft were the flybar meets. If there is some whiteness around that point, you may have wear. Another thing: The center section of the swashplate(where the links from the flybar attach) tends to separate from the lower portion. If that happens, the helicopter becomes very difficult to control. Two ways to fix that and one isrelated the Jeff and Kruser's posts:

1. Usethe calibration tool (the red u-shaped plastic thing) to recenter the swashplate.
2. If the inner portion of the swashplate is not level with the bottom portion, you can either use the calibration tool to squeeze it back in (fingers work, too), or you can disassemble the head and swashplate then apply a TINYamount of CA to mating surfaces of the upper portion of the swashplate. I say TINYamount of CA because you don't want to get it in the bearing.

Scott