Euphonix System 5 Control Surface/Frame Manual page 17

18) If the network, power, and talkback mic cables are not going to enter the S5 frame
from the bottom of a leg, then the leg panel supporting the cabling will have to have
its knockout plate removed. Remove the leg panel from the leg before punching.
The punch direction should be from the outside to the inside. Support the knockout
hole on the inside of the leg panel with a roll of duct tape, or something similar.
This will alleviate any distortion to the leg panel metal while punching.
S5 Control Surface/Frame Manual Page 17 Version 1.0 ©1999 Euphonix, Inc.