Quantum Scalar 218FC User Manual page 111

If the holes in the uprights of your rack are square, you must install the plate/rail subassembly using the
large collared spacers included in the hardware. If the holes in the uprights of your rack are round, you
must install the plate/rail subassembly using the small collared spacers included in the hardware. This
will position the rails correctly.
While an assistant holds the plate/rail subassembly in position, secure each rail mounting flange to
the rack upright with a spacer and a 10-32 x ½" phillips head screw. The spacers are positioned on
the outside of the rails. Be sure that the small end of the spacer is inserted completely into the hole
in the upright. Tighten the screws.
Scalar 218FC Rack-Mount Installation 101