Thanks guys for all the replies. I feel instantly at home here at the forum!
I guess soldering is the more appropriate word for what i had in mind. Didn't quite figure it out yet what alloy these parts are made off. Can't find any reference for "monkey metal"
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The alloy is mainly zinc with additions of magnesium, aluminum and copper. Often referred to as ZAMAK. Am i right?
I think i'll give it a try with Durafix, witch is available in the Netherlands.
Some of you pointed out the possibility of a fuel leak and the adherent risk of fire. Thanks for that. If a im not for 100% confident that its safe i will swap the bowl immidiatly.
And very generous of Menno to offer pre owned ones. I like that more than a new one because of the patina!
Cheers,
Jan