An adjustable fin system comprising: a plug assembly, the plug assembly comprising: a plug housing, the plug housing comprising: a closed end; an open end; a plug first set-screw hole; a plug second set-screw hole; a cylinder configured to be rotatable within the plug housing, and installable into the plug housing via the open end, the cylinder comprising: a cylinder first set screw hole; a cylinder second set screw hole; a cap configured to generally close the open end of the plug housing and to restrain the cylinder from leaving the plug housing; a fin removably attachable to the cylinder; where when the plug first set-screw hole is aligned with the cylinder first set screw hole, the fin is at a first fin cant; where when the plug second set-screw hole is aligned with the cylinder second set screw hole, the fin is at a second fin cant.