Kaidan KiWi+ - Manual (Page 9)

Page - 9
Push the axle through the bearing and plate as shown below.
Reverse the disassembly.
Replace the cap by threading the cap onto the axle as shown
below. Continue to thread the cap so that there is no free play
in any of the pieces and to compress the rubber washer
slightly.
When the friction drag feels adequate, turn the Friction cap
so that the knob is aligned with one of the flats on the axle.
Tighten the knob to lock.