custard point fins?

[voyager]

anyone know how to remove custard point fins? they look like you turn them, but I dunno if you then yank them out which might break them, or keep trying to turn them, drop a
allen key [?] down the hole on top

any clues?

[oldmansurfer]

Not familiar with those fins but it is likely you need an Allen key wrench to losen it. A quick google seems to show this

[voyager]

just figured it out...big allen key, fins are off!