I sprayed mine with penetrating oil and then used an L shaped 6mm hex key to loosen the them. Use a pick tool to get any dirt out of the hex head and make sure the key is seated all the way in. I used a ratchet handle to give the hex key a few impacts to loosen the bolt.

__________________
Chad
2013 Jeep Unlimited Rubicon
OBK#44
"Pleasure in the job puts perfection in the work." - Aristotle (384-322 B.C.)

SOLD
1985 300TD - Red Dragon
1986 300SDL - Coda
1991 - 300TE
1995 - E320
1985 300CD - Gladys
2006 Nissan Pathfinder LE
1998 Acura 3.0 CL