Originally Posted by scada
On my 2013 S it is not a Phillips it is a bolt head. 13mm was too big and 12mm too small. I don't have any English 6 point sockets. The hex actually turns a horizontal gear, not sure why they couldn't of eliminate the gear and come into the adjustment from the top.
1/2" is 12.7mm so that would be the logical choice. It is odd that there should be a mix of SAE and Metric hardware but I guess that's the way the US auto industry rolls...
2012 FF Ti HB Sonic Blue, Built 5/7/12, 401A + Parking Technology Package and MFT w/NAV 3.0.2 -> 3.2.2 -> 3.5.1 -> 3.6.2