+1 Popped down the street to Sears, picked one up.Yup, 14 is correct.
Should be able to get them from Sears.
http://www.craftsman.com/shc/s/sear...Tools+&+Equipment&keyword=14mm+allen&sLevel=0I got mine from Harbor Freight...Came in a set with 4-5 other allen sockets, paid $10 I think for it all.