W126: Bilstein shocks question

About 3-4 months ago, I had all new Bilstein shocks installed in my W126.

I have noticed that the upper bolts on top of the front shock towers turn rather easily; not tight by any means.

Wuestion: how tight should these bolts be? I have the feeling that my local guy just didn't install them correctly, in this regard. Any help you could give me would be appreciated.

And if they need to be tightened, how to do it? There is one bolt, and the shaft has a slot for a screwdriver. However, can't get enough grip to keep the shaft immobile while attempting to tighten the bolt.


Also: If I want to check tightness of upper bolt on the rears, I need to remove the seat. Any tips on removal of rear seat in W126?

Thanks.