Instruction manual

12
NOTE: Two different hardness of o-rings dampeners and three sets of shim thickness are included. The specific
dampening may vary depending on the main blades chosen or your personnel flying style. We suggest starting with
the o-rings and shims described in the following building sequence.
-Std. Dampening 4 70-D O-rings (#0844-2)
2 (0.050”) Shims (#0331)
-Stiffer Dampening 2 70-D O-rings (#0844-2)
2 80-D O-rings (#0844-)
Various combinations of the #0329, #0331, or #0426 Shims
A. Select one #122-02 Head Axle, two #0844-2 70-D Rubber O-rings. (Do not lubricate the o-rings with any
oil, grease or Vaseline. If aid is needed in installing the O-rings, use only liquid which will evaporate
such as window cleaner). Center the Head Axle in #122-14 upper head block. Slide two #0844-2 70-D
Rubber O-rings on each side of the Head Axle. Push the O-rings into the upper head block while centering
the Head Axle.
B. On one end of the Head Axle assemble the following components in the sequence shown.
1) one #0331 M8 x 13 x 0.5 Shim
2) one #0848-3 Hinged ring (cupped side facing the o-rings)
3) one #0319 M8 x 16 x 5 Ball Bearing
4) one #0848-4 Aluminum retainer sleeve (counter-bore side facing the bearing)
5) one #0840-12 Thrust bearing ( 3 pieces )
Special Note: The thrust bearing will contain one outer ring that has a smaller I.D. hole than the
other outside ring. Identify this feature before proceeding. Install the larger I.D. bearing race
with the groove side away from the retainer sleeve. Apply grease to the groove. Next slide the
ball/cage into position, using more grease. Slide the remaining small I.D. bearing race into
position with the groove facing the ball/cage.
6) one #0840-10 M8x12x0.80 Spacer
7) one #0319 M8x16x5 Ball Bearing
8) one #0011 M5 Washer
9) one #0086 M5x12 Flanged Socket Head Bolt
NOTE: Sparingly apply Blue Loctite to the threads and install into the Head Axle.
Tighten only finger tight at this time.