STEP 1: Remove the tail fin, then insert the securement extender into the fin box slot using the supplied wood dowel as needed for installation using Figures A, B and C.
STEP 2: Insert the securement into the fin box slot using the supplied wood dowel for installation as needed using Figures D, E and F.
STEP 3: Insert the two supplied screws and tighten with the supplied fin key to join the securement with securement extender. When finished, reinstall the tail fin in front or in back of the securement. This locking device was created so you only have to install it once and it stays installed permanently if wanted. Contents: 1 securement , 1 securement extender, 1 fin key, 2 screws and 1 wood dowel to be used as an installation tool only.
* Figure images are a side cut-out view of a standard longboard fin box