The weight of the anode tends to drop the far end and makes it difficult to start. You have to push down on the bottom face of the "bolt head" to make sure it's perfectly horizontal while you try to thread it in. I've never needed a socket to do it; can always do it by hand.
1988 Coleman Sequoia - popup (1987-2009)
2012 Roo19 - hybid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10