Geo and I had problems with his nearside mirror but discovered later that the solution is to move the whole stalk in by one detent...its spring loaded. Tried it out on the 4/4 that I tested this week (and am buying!) and it worked!
I'm sure he won't mind mentioning that he got a wet right leg.....forgot to pull the flap over the top of the sidescreen frame.
Having struggled with just that on my test drive, I guess that there is a knack to it!!