FCSII is a keyless system. To insert a fin into the plug, place the front tab of the fin inside the front slot of the plug so that the hook in the fin tabs meets the horizontal bar inside the slot. Then, lower the rear tab into the rear slot of the plug until the mechanism engages the tab. This mechanism will hold the fin in place until removal. To remove the fin, grasp the fin and pull upwards.
A full instruction booklet comes with every FCSII fin set.
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