Originally Posted by david_e_m
Most use a 1/2" plastic chassis grommet to dress the wire penetration in the tower so that the wire insulation does not get chafed. The mini clamshell shown is certainly an option. I'm concerned over the use of a three pointed sheet metal screws going into the tower tube interior where wires live, especially the 12 volt anchor light wire. Use sacrificial screws to thread the tower tube wall in advance and then flatten the point of the actual screws before insertion. Keep in mind that stainless steel hardware is softer than normal and is prone to breaking. As an alternative you could drill and tap and use three tiny fine thread machine screws with blunt tips.
Thanks, I found the clam shell vents online, I just wanted the new ones to match the existing ones