Apologies folks but I hadn’t looked at the thread in a few weeks. My wooden Finn mast and boom has a wooden wedge to fit into the mortise somewhere. It came with the mainsail so once we are out of lockdown I will investigate further.
There were no floorboards in the boat when I got it but there are frames to support floorboards. I will make a new set as part of the restoration.
Now if only I had brought the boat home to my back garden I would be able to do some work on it.
Thanks all.