The cable at the threaded section is 7/16" OD. Ultimately you need to also take into account the diameter of the pass through that you are using, be it a snap bushing, silicone grommet etc or something fancier like The 1/2" version of one of these, which just fits the Vans supplied cables. http://m.aircraftspruce.com/catalog/elpages/firewall_penetration_kit.php
Tom.
The cable at the threaded section is 7/16" OD. Ultimately you need to also take into account the diameter of the pass through that you are using, be it a snap bushing, silicone grommet etc or something fancier like The 1/2" version of one of these, which just fits the Vans supplied cables. http://m.aircraftspruce.com/catalog/elpages/firewall_penetration_kit.php
Tom.
Just to be clear, if the OP is talking about drilling the cable mounting holes in the F-10105 Control Cable Bracket on the Instrument Panel lower flange, no grommets or pass-throughs are required.