Kendall Howard 5000-3-40x-xx Performance 400 Series LAN Station - Manual (Page 9)

Step 8. Attach Upper Shelves
Insert a 1 ½ Hex Drive Bolt into each shelf support hole and place a channel nut onto
the bolt as you did for step 9. Remember to keep the hex bolt facing up and down.
Place the shelf on the shelf channel with the channel nuts inside. Tighten the bolts and
cross head screws. Make sure these bolts are very tight.