Light leak from WLF on P67 long exposures ?

Photopathe said:

From time to time I do have a shot with some subtle traces of light leaks when shooting in strong light at certain angles. I always tough it's just normal it happens sometimes but now I wonder if at least some of them were caused by this design flaw.
So I am thinking about adding foam all around the edge. Will probably do it but then again it's an expensive camera so makes me nervous. Maybe there is a reason they didn't put foam there. I suppose if something go wrong I just have to remove the foam.

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