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Step 3. Place the drive wheel (#34) in to the drive wheel holder (#35) and fix it in
place with an M4 x20 screw (#27) and M4 washer (#6). Lock the other
end with a M4 lock nut (#11). You may need a wrench to tighten M4
locking nut (#11).
*in the video, we use M4x25mm, it is too long, so we can use M4x20mm here.