Now secure each axle by slipping a knob on, rotating it while pushing in
until the screwhole is right over the at area on the axle. By screwing the
screw in slightly rst, then rotating the knob until it seats, you can tell
where the at area is.
Making sure the D-slot is lined up as described. Use the included small
hex-key to secure the knob while pushing it lightly against the frame.
Repeat this on both sides.