powebox fin safety
thanks for advice.i will put seal below washer and tighten with larger screwdriver.
the fin i bought was second hand and was very loose fitting.
i had to pack it with heaps of fin cover sponge.
better to buy a fin to large and then to sand back to fit.
going to put a few layers of nail varnish over my other powerbox fins so they are extremely tight fitting in box.