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stamp said..
Although the quad setup needs more persuasion to turn on rail or tail than thruster
You may want to cut off the head of the rear fins.
This way you keep the hold from the base, but free a lot the board.
Too bad Quobba did not put their rear quads in production instead of pursuing the gimmick of their "slider" concept...
You can see how they are basically normal fins with the head cut off: