Preparation of dowel pins

Source : https://docs.zerog.one/assets/mercury_one_1_instruction_18-02-2024.pdf (From https://docs.zerog.one/) 

Page 33.

PREP / DOWEL PINS / STEPS
Test fit the bearing onto a dowel pin. If the fit is tight, DO NOT force the bearing. Instead, set aside the pin to be sanded.
Test each pin, then follow the directions below to sand them.

TEST FIT
1. Insert the tip of a pin into your electric drill chuck and tighten.
2. Hold the sandpaper with the grit side folded around the pin (below left).
3. Run the drill at a steady speed to sand your pin.
4. Periodically stop to test fit the bearing again.
5. Stop sanding once the bearing slides on and off without resistance (below right).
6. When finished, flip the pin and repeat steps 1-5 with the remaining, unsanded portion of the pin.

Picture source: jonspaceharper, & ZeroG. (2024). Mercury one 1 instruction. ZeroG. https://docs.zerog.one/assets/mercury_one_1_instruction_18-02-2024.pdf