I haven't seen anything like that before, but if that's the cleat next to the mistral logo, I'd try using the mast lashing you show, with the boom tight against the mast, and parallel to it. From the mast, thru the top side of the handle, back round the mast to the lower side of the handle, back thru the handle pull as tight as possible and cleat. Then pivot boom out to right angles, with any luck that will tighten it enough.
Good luck!!!!

Thanks 'decrepit' I hadnt tried laying the boom right against the mast and levering down -
that does seem to give a tighter grip and wedges the rope into the cleat. It seems rather minimal but it does work! So thanks for that!
'Dism' thanks for your advice too. That was always going to be be plan'B'.
I used to sail a Windsurfer in the early 80's - I saw this big old board and its kit on ebay and got all nostalgic.
If I could have found an original Windsurfer I would have snapped it up -
Ah the good old days ....the Mistral seemed
like a good stand in.

Stan

Dism, I guess some of us old guys are guttons for punishment.
I cant find those 'tips on rigging tie-on-booms' - you couldn't post a link could you?
Stan.

Yes do the right angle thing just like decrepit said, you can get it so tight that it is possible to crush the mast.

So with the boom sitting same direction to the mast I would thread the rope through that little hole, around the mast (possibly twice) then back through the same hole and tie it off. If you've done all that tight, when you pull the boom out to a right angle it should pull super tight. Note: if you have to really force it to right angles you may break something, just loosen the ropes. Just make sure your rope won't stretch at all or it will loosen during sailing. It looks pretty similiar to what my brothers and I used to use in the 80's.

Hope this helps.

Hi, Stan,

As a suggestion, you'd be better to buy a new or 2nd-hand boom that features a modern "quick connect" front end. If you go new, get the salesman to attach it to the mast whilst you are in the shop.

Modern booms can be fitted in considerably less time than your type and do not have the propensity for mast crushing (if over-tightened) or mast slippage (if under-tightened). They also reduce "point pressure" on the mast, by having a full-floating or semi-floating front end design, which allows the boom to be at an angle (usually downwards) to the mast, thereby reducing stress in the mast.

As a suggestion, you might consider the Neil Pryde X3 range, but really, anything with a Q.C. front end will do the trick.

Should have suggested this earlier today, but enjoyed tracking the links that others provided anyway (thanks to the others), which brought back memories.

Hope this helps,

Regards,

WindmanV

Thanks for the further advice everyone.
It works both ways - through the handle and through the hole.
I also assumed the hole was for the uphaul (which i still think it is - the uphaul tied to the mast is pretty messy).
The rope through the hole looks more secure but actually it seems to tighten less when you lever the boom back down into position.
Going through the boom handle sort of triangulates the points of contact and it seems a little steadier.
Thanks again for everyones input,
Stan.