The upper rotorshaft bearing needs to be perfectly perpendicular to the rotor shaft. Allowable tolerance is .007" max. I used a small dial test indicator and made a rigid fixture to spin the dial indicator around the shaft and have the dial indicator ride on the ridge of the bearing housing. I made multiple sheet metal shims out of .002,- .005 and .008 shim stock to adjust the bearing housing. After 2 hours of adjusting the shim thickness for each of the 4 bolts, I ended up with a misalignment of .0005", which is well within the required tolerance. The fixture allows measuring the misalignment of the bearing housing without taking off the swash plate, which is nice. I torques the 4 bolts to spec and added some paint dots. I intentionally installed the four bots up side down so I can monitor, if any of the nuts would come lose.
