Quote Originally Posted by MartinT View Post
R2 and R4 perform no function with Q1 gone. C3 helps provide a little more regulation to the 21V line for the motor drive circuit.

Yes, I leave the plastic cover off because it sounds better. I did that ever since installing the MN bearing.
Martin would have one of my earlier bearings which may permit the use of the plastic cover.
On the later batches of bearings, the three locating posts which locate into the coil assembly are longer in order to obtain improved rigidity and concentricity.
The plastic cover will not fit onto the coil assembly with these bearings fitted as the longer posts interfere with the tangs on the plastic cover.