NSP / Mini Tuttle fin box, adjustable

NSP, or Mini Tuttle fin box, lengthened to allow multiple fin positions.I designed this box to be compatible with NSP fins, but have 5 options.This is done by clipping removal blocks into different places in the box. The blocks are angled, and so need to be reversed when moving, to leave the correct angled end to the remaining slot.Bolting the fin in place securely locks the blocks in place.