\n
\nThe fin head is 9mm wide and will typically have a Roll Pin or Solid Pin of around 5mm Diameter and 14mm length running sideways through the head at the rear or the front, which is designed to engage with a concealed slot on either side of the fin box 9mm wide opening to take the head, usually accessed via a cut out of 15 to 16mm width in the centre of the box or the end.
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\nThe Brass T nut is slipped into the same slot, having pre engaged rear or front 5mm Dia pin.
\nThe fin is secured by inserting the M4 Screw through the hole in the fin and engaging this with the thread in the T nut.
\n
\nSimply tighten the screw to secure the fin (some fins need slight modification to fit boxes or different screws)
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