Botom braket removal Advice please.

afp401

MacRetro Rider
I had a wee go at it but it's not budging.
Before I crank up the force I wanted to ask: Do I remove this like a normal cartridge Botom bracket.
It looks like one to me but then I spotted the threads and wee nut on the axle so started to wonder if i have to remove that first?
I'll give it a scrub before i try again too.
Thanks
Steph
 

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Re:

Thank you! Will give that a go. What thread/diameter was the forced in bolt to start with please?
Edit and yes its a marin.
 
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