My C-Tug strap kept slipping down during transport on my Old Town Predator kayak, so I made this simple keeper to hold the straps in place. All that is needed are two #6 3/4 to 1" wood screws (preferably zinc or better) to mount to your prefered location.

I recommend using at least 3 perimeters and at least 30% infill when printing to ensure rigidity. It's probably overkill, but this is a small part and the material difference is negligible.