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HK_Berlin
@OliB
The other piece of the puzzle is this photo - using a 5mm chainring.
I have that chainring and tried fitting it, and the hidden spider was too thick. If you zoom in, you can see that there's a slight lip of the chainring on the 4 normal spiders, because the chainring is slightly thicker.
So it looks like it is possible - but unsure if I need to take a grinder to the spider or not.