Check for lateral play in the pitch control arm by moving it side to side. If the pitch control arm moves, you can remove this lateral play by using Loctite adhesive (blue) on the external surface of BK0076 and Bk0078 collar. Allow the Loctite adhesive to cure and repeat the check for lateral play.

This causes the collars to adhere to the inner race of the ball bearings thus preventing the pitch control arm to move side ways.

Another alternative method is to shorten the length of BK0076 and BK0078 collar. Remove small amounts of material at a time and trial fit. Be patient as too much material removed, will cause the pitch control arm to bind.