Bob1150GS,
Remove the nut underneath which attaches the mirror. Then remove the mirror by lifting upwards.
Undernesth the switchgear nearest the clocks you will see a cover that is fixed by two screws, remove these screws and lift away cover.
Next there is a screw undernesth where the cover was and another at the back of each resevoir, remove these and the switch gear will come appart.
You can now gain access to the clamping screw, by losening this you will be able to set your grips to any angle.
The whole process from start to finish took me about 20 mins, 'baring' any problems - 'baring' - do you get, see what I did with that - ha ha ha !!!!!!
Any further questions please feel free to pm me.