small problem

[Edwin Harris <mail@edwinharris.net>]

I'm having a problem removing the sending unit of the temperature gauge 
from the head in my BJ8. All wrenches are too thick to get on the brass 
nut securely. Haven't found an open-end wrench which has enough room to 
move at all due to the proximity to the head and the wrench for brake 
hose fittings is too thick, also. Filed a slot in a boxend but then it 
was too flexible to grip well enough.   Any suggestions?