The extension motion happens very quickly so you may miss it when it is running. If you turn on the wiper on low speed with the ignition off and bump the ignition so the wiper sweeps a little bit at a time you should see it extend. It moves out roughly 3 inches give or take, from my memory.

Rgds,
Chris W.
'95 E300D, 408K

__________________
Objects in closer are mirror than they appear.