Oxy Heli oxy2 Instruction Manual page 19

Chapter 8: Main Frame Alignment
OXY0459-Main Shaft
(Box 1-1/Bag 8)
Install main shaft with frame assembly
on a flat surface, push down on both frames
together and then fully tighten all M1.6x5 hex cap
screws (x8) holding the bearing blocks.
Flat Surface
page 19