Patent ID: 7025645

Claim:
A removable fin system for use in a surfboard comprising: (a) at least one dumbbell-shaped hole formed in the surfboard, and a matching dumbbell-shaped fixing plug firmly placed in the dumbbell-shaped hole, the fixing plug has a lengthwise elongated slot formed therein; (b) an elongated tab extending from a base of the removable fin, the elongated tab being constructed to be received in the elongated slot of the dumbbell-shaped fixing plug so as to affix the removable fin to the surfboard; (c) a plurality of first protrusions formed on an upper portion of both sides of the elongated slot of the fixing plug, the plurality of first protrusions are formed and spaced apart such that they create a plurality of vertical passages in the upper portion of the slot and an elongated horizontal open passage in a lower portion of the slot; (d) a plurality of second protrusions formed on a lower portion of both sides of the elongated tab, the plurality of second protrusions are formed such that they can be inserted vertically through the plurality of vertical passages in the upper portion of the slot, then move horizontally along the open horizontal passage, so that the plurality of second protrusions are retained below the first protrusions.