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.
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