I've taken out the electronics of two servos. I've put grease on the reduction mechanism. But even before beeing hacked, one of the servo output wheel was spinning out of center. It's not that noticeable, but it makes a weird sound when I connect the horn. There is still some skreeching without the horn.
I drilled holes through a wheel (although, they were drilled badly): 2, further away from the centerand at fixed locations, on the wheel's diameter (so holes + center are colinear) put resistors through the holes and into the servo horn. The wheel was spinning terribly out of center.
The same thing happens on the "good" servo. I've checked the unhacked servos, and those, too, seem to be spinning a bit off the center.
What should I do? No tutorial ever mentions something about this problems.