Instead of using that BIG 17mm allen wrench, buy the little 17mm hex adapter
for your socket wrench. Many bug shops have these, or molest the Snap-On
Tools guy when he stops at your local garage. You should be able to get to
the plug with one of these on a small socket drive.

Best of luck.

GMB, Fairfax, VA
lookin' a '87-'90 Westy
1985 Jetta Turbo Diesel
1976 Transporter (AGAIN?!!)
ex 1976 Transporter
ex 1972 914 2.0
ex 1973 Squareback
ex 1985 GTi
ex 1970 914 1.7
(family) ex 1972 Transporter
(family) ex 1962 Microbus
(family) ex 1958 Karmann Ghia