how to adjust alternater belt on A/C equipped micra??

[smidge]

hey guys, doing an A/C conversion and just after some info on how to adjust the tensioner?

do you have to loosen the nut on the pulley itsself? bloody bastard of a nut to get to if you do? any tips??

pic here...

 

[smidge]

sorry... ACCESS to the tension nut thru that bit, the nut itsself is in the obvious place...