I do a bit of windsurfing and the masts have got narrower over the years. I have an adapter that goes on the mast and then the clamp on the boom clamps to the adapter. Unfortunately the adapter is made from a fairly hard plastic and the joint slips.
It is just a round pole with a round clamp, the clamp is oversize.
I want to make my own adapter and had a look on ebay. I saw two possibilities. Silicone sheet and reinforced conveyor belt, both at 6mm thick.
Any thoughts for a good material which will not let the clamp slip down? thanks