Yea, it's all verry well turning it with a screwdriver when the Webasto is out of the engine bay. To move it while in the engine bay I found that I had to move the air filter that sits above the Webasto and get both hands, one either side of the Webasto, and move it with one finger from each hand. I now actually have little blisters on each middle finger after doing that today!
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How difficult is it to take out to service it anyway?