Hi Stewart,
thanks for the warm welcome and you seem to be right.
Hi Dave,
seems to be a harder work as I thought, but if it's the only
possible way, I have to do it like that. But does anybody now
the way this damn plastic part works?
I've lifted the black seal from top of the base and there was
no way to get this part off.
And finally I have to say that google could make life much easier, but automatic translation is worth in technical questions ;-) It only works with small talk :-)))