I have a "Wayler YPSI" made some bygone year before i was born, a time when the UJ was just a glint in the eye of young sailor. Instead of a mast track, it has two bizarre cylindrical sink holes, where (I assume) some antique style hinge is suppose to connect the board to the mast.
So, i'm looking for a seasoned and knowledgeable sea dog who'd be familiar with this type of board, or if they've seen anything like it. Or do i need to break out my custom-job-hat and start hacking into the mast box?
Please help, i don't want to see a good board gone to waste.
Thanks for your time, David
is that the one where you pushed a black cylinder (mast base) into the hole then twisted the top of it to create suction to hold it in place? the UJ was White nylon rope... That is what I learnt with.
My friend still has a Wayler with this system.
A black cylindrical bung goes into the hole and you turn a threaded collar above it which squeezes the bung and makes it fatter.
(In the same way that a wine bottle stopper works 
)
When I used it it was difficult to get it to grip and then difficult to get it to ungrip.
I'd be tempted to permanently attach whatever mast foot you want by filling the hole with Araldite Epoxy Resin and pushing the mast foot thread into it
(after adding some nuts along the mastfoot thread length for the epoxy to grip)
I'd go for the back hole as the centre of effort of more modern sails has moved forward towards the luff.
Actually that old plank sailed quite well. For an old thing.
Sometimes windsurf shops have a bucket with old parts at the back of the store, perhaps you`ll get lucky.
I learned on a ypsi many years ago. As steve bayside says...there is a rubber pin (the brown rubber bit in the middle of the pin shown above) with a collar above it and when turned it compress the small rubber part and fattens to hold it in place.
those rubber locking systems were very common on boards back in the day.
i think some of the bombora boards may have used it.
was definitely used on funboard styled longboards from other manufacturers.
you should be able to find replacments at your local windsurf shop in a bucket hidden in the dunny somewhere.
just read your post pierre. 
Wow, i wasn't expecting anyone to reply at all. Thank you so much guys! I've got some options now. My appreciation to all who've replied. Dav
Hey David, if you're still stuck after all the replies:
the standard old Windsurfer attachment is a simple metal plate with 4 screws. Of course you don't want to screw it straight into the board.
If you have a piece of wood that emulates the old windsurfer mast tee, say half-inch thick, and round with a 3-4 inches radius (the smallest that works).
That half-inch wood bit would have a hole where a very large & long screw would fit. The screw would go into the hole, which would have a very tight rubber filling (rolled up old tubes, something like that). The large screw would widen the filling until it holds in place, then you screw in the metal windsurfer stock part (easier to find) into the wooden bit.
Fiddly, but I do sail old planks too when the wind is light. No holes in the board that way.
The slot between the 2 mast base positions, besides being somewhere to grab the board for carrying, also fits a standard square Windsurfer mast base. YISIs where the type of plastic that had to be plastic welded to fix cracks.
