Kayak mast step

Intended for a DIY sailing kayak with a stayed mast. This is the 3rd iteration of the mast step based on how I use it (I don't need a folding mast, and I want to store the naked kayak upside down).

I created a fiberglass adapter to fit this flat surface to the contour of my kayak - you will need to do something similar to get a tight, flat fit.

20mm inner diameter
Drain hole
Mounting holes