Kerry:

I had good fortune from way, way back. If memory serves me correctly, I used a 2 foot extension and a couple of universals. Fortunately, those recessed allens give good depth so that you can put some serious torque on it. Didn't have to remove anything. Went back together the same way.
I found the job significantly easier than the alternator or block heater install.

Don

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DAILY DRIVERS:
'84 300DT 298k (Aubrey's)
'99.5 Jetta TDI IV 251k (Julie's)
'97 Jetta TDI 127k (Amber's)
'97 Jetta TDI 186k (Matt's)
'96 Passat TDI 237k (Don's
'84 300D 211k Mint (Arne- Undergoing Greasecar Conversion)

SOLD:
'82 240D 229k (Matt's - Converted-300DT w/ 4 speed