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A device comprising a substantially vertical post member that can be adjusted longitudinally within a fin box and remain vertical, riding adjustably in a longitudinally oriented slot and thereby protrudes from the bottom of a standard fin box customarily installed in personal watercraft such as a su

A device comprising a substantially vertical post member that can be adjusted longitudinally within a fin box and remain vertical, riding adjustably in a longitudinally oriented slot and thereby protrudes from the bottom of a standard fin box customarily installed in personal watercraft such as a surfboard, sailboard, paddleboard, and the like. The securable end of a removable fin is dropped over the post and held in place by a nut, clip, hook, or clamp.

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1. A device for releasably attaching a fin to a fin box of a watercraft comprising a body portion configured to reside primarily within the fin box,a substantially vertical post member connected to the body portion,at least one laterally extending member affixed to and extending from the body portio

1. A device for releasably attaching a fin to a fin box of a watercraft comprising a body portion configured to reside primarily within the fin box,a substantially vertical post member connected to the body portion,at least one laterally extending member affixed to and extending from the body portion and configured to extend into at least one longitudinal slot formed in a sidewall of the fin box and configured to allow the device to slide longitudinally within the fin box while the post member remains in a substantially vertical orientation to receive a hole in the fin, anda hook member hingeably connected to the body portion and configured to extend around and abut a portion of the fin to hold the fin in place and configured to hingeably move away from said portion of the fin to release the fin from the fin box. 2. The device of claim 1 further comprising a detent member extending from either the body portion or the hook member to reduce the amount play for the fin when the fin is retained in the fin box. 3. A device for releasably attaching a fin to a fin box of a watercraft comprising a substantially vertical post member,a body portion connected to the post member,at least one laterally extending member connected to the post member and configured to extend into at least one longitudinal slot formed in a sidewall of the fin box and configured to allow the device to slide longitudinally within the fin box while the post member remains in a substantially vertical orientation to receive a hole in the fin, anda hook member hingeably connected to the post member and configured to extend around and abut a portion of the fin to hold the fin in place and configured to hingeably move away from said portion of the fin to release the fin from the fin box. 4. The device of claim 3 further comprising a second laterally extending member on the same side of the body portion as said at least one laterally extending member and offset therefrom to help reduce an amount of play as well as any tendency of the fin to move fore or aft movement once the fin is securely retained in the fin box. 5. The device of claim 3 wherein said at least one laterally extending member is oblong and slanted to help reduce an amount of play as well as any tendency of the fin to move fore or aft movement once the fin is securely retained in the fin box. 6. The device of claim 3 further comprising an elongate lever along a bottom edge of the body portion and configured to add strength and reduce any tendency of the body portion to flex. 7. The device of claim 3 further comprising a detent member extending from the body portion to reduce an amount of play for the fin when the fin is retained in the fin box. 8. The device of claim 3 further comprising a detent member extending from the hook member to reduce an amount of play for the fin when the fin is retained in the fin box. 9. The device of claim 3, further comprising an end spacer to insure that the body portion does not venture so close to a far end of the fin box to make it difficult for a user to hingeably move the hook member. 10. A method of releasably attaching a fin to a fin box of a watercraft comprising slipping at least one laterally extending member extending from a retaining device into a horizontal slot in the fin box such that a substantially vertical post member resides in said fin box and oriented substantially vertically,lowering a through hole in a tab portion of a detachable fin over the vertical post,securing said tab portion in the fin box so that the detachable fin is securely yet releasably attached to the watercraft,wherein the tab portion is secured by an end portion of a hook member that is hingeably connected to the vertical post member and wherein the end portion of the hook member is configured to extend around and abut a portion of a surface of said tab portion. 11. The method of claim 10 further comprising applying a force to the end portion of the hook member to move said end portion away from said tab portion of the fin to release the fin from the fin box. 12. The method of claim 10 further comprising slipping a second laterally extending member that is on the same side of the body portion as said at least one laterally extending member and offset therefrom into the horizontal slot in the fin box to help reduce an amount of play as well as any tendency of the fin to move fore or aft movement once the fin is securely retained in the fin box. 13. The method of claim 10 wherein said at least one laterally extending member is oblong and slanted to help reduce an amount of play as well as any tendency of the fin to move fore or aft movement once the fin is securely retained in the fin box. 14. The method of claim 10 wherein the retaining device has an elongate lever along a bottom edge of the retaining device that is configured to add strength and reduce any tendency of the body portion to flex. 15. The method of claim 10 further comprising reducing the amount play for the fin when the fin is retained in the fin box by applying a force of a detent member extending from a surface of the retaining device. 16. The method of claim 10, wherein the retaining device further comprises an end spacer to insure that the retaining device does not venture so close to a far end of the fin box to make it difficult for a user to hingeably move the hook member.