Surfboard ceiling mounts for 80x16 aluminium rail

I wanted a way of sliding my surfboard into my van after a session because tying it to the roof bars is a major faff. The solution I came up with was to install some aluminium rails on the ceiling (see instructions here: https://www.printables.com/model/1290425-ceiling-rail-hardware-for-80x16-rails-in-vw-transp). I then designed these “hooks” for the front rail so that my surfboard can be slid into place. 

On the rear rail I installed some hooks. Once the surfboard is resting on the front two hooks, it can be secured under the fins at the rear using a length of rope and a carabina.   

To secure the hooks you'll need: 

• 4 x M6 “kayak” bolts (they slide into the rail)
• 4 x M6 butterfly nuts or some other M6 nut to secure the hooks to the rail

I also superglued some leather strips to the hooks to avoid scratching the board. 

For the rear rail you'll need 2 x hooks on M6 bolts with M6 t-slot nuts. 

I printed these in PETG at 50% infill using tree supports (see photo).