I liberated this Jurassic age Windrush Fun 11 from the local tip. It's in reasonable condition and I'd like to get up and running. I've got a mast but the base fitting doesn't match the sliding fitting on the board.
Perhaps someone might be able to help me get hold of a suitable fitting.

I reckon best to just use a new style one where the nut slides in the mast track - just a bigger nut.
If you cant find one, its easy enough to get a bit of scrap stainless plate and tap a thread thru it

I had this brass fitting made up many years ago when you couldn't buy the plastic ones any longer. I probably should upgrade.

Thanks for that Agrid, now I understand what one looks like and how it works. I might just get some high density plastic and spin one up on a lathe.

Looks like a similar track to a Mistral One design. I have one and use a standard euro pin mast base and brass plate with a thread that you can either make or buy www.windance.com/Mistral-8mm-Mast-Track-Slider/2359/

Can't adjust it while sailing but I'm not that technical a sailor to need that anyway. I just hold it in with a finger while screwing the mast base in.

originally tried to post about Fanatic CAT mast base - same as this one
that is difficult to find tho ...
as people have suggested, with that track you can make a metal plate with a hole in it
NO thread required - bolt standard Chinook base through the hole
did that with my Mistral Equipe One

I can measure if you like.

That would be great if you could measure it for me.
Thanks!

This any help? Mine is pretty worn but still stays in. The plastic ones never used to last that long so I had one made up in brass.

That looks great. I think I'll go for a metal one as well.
Will be nice to get back into windsurfing.....it's only been around 30 years!