Maybe someone has a mast he does not need any more?
A brand new 80cm one: 69€ + 10-15 shpng … just in case 
I have a new Slingshot Profile one. all new about 80cm 60€+shipping
Hello, can you post pic or send me pm?
Hey Toto44, I just wanted to give an order of idea…
https://gongsupshop.com/epages/box1707.sf/en_GB/?ObjectPath=/Shops/box1707/Categories/FOIL/Surfoil/AilesStabsFuselagesMats
nice, thanks. Is there a deep tuttle box adapter availible for this mast?
Yes, on another page. The boss knows his job: the 4 known tuttle mast heads are there…
https://gongsupshop.com/epages/box1707.sf/en_GB/?ObjectPath=/Shops/box1707/Categories/FOIL/Surfoil/Pieces_detachees
Then there is the feasability. If it is for an efoil, you will have to drill and fragilise the head. It is the reason why everybody uses a … plate 
The GONG mast heads are the same as NAISH or AIRUSH:
http://www.naish.gr/windsurf/accessories/tuttle-foil-adaptor.html
more expensive (130+ €) but they offer a small plate which allow to spread the strain much better on the board bottom skin. Mantafoil does that also but not the same 2x40mm screw pattern
as GONG