ODYN LeetDesk 1.0 Series Assembly & Instruction Manual page 10

Step 2
Insert the center rail (3) into the frame (2) on both sides, and
adjust the appropriate position (note: the word "MAX" on the
center rail must not be completely exposed).
Then put the M6x30 machine screw with the round head (13)
into the position as shown in the figure and tighten it with a
4mm hexagon wrench.
13
2
2
3
If the adjustment of the width is a bit difficult, move the
middle rail around several times to achieve a better
smoothness.
If you drop a screw inside the frame end, simply tilt it to
retrieve the screw.
9