Did not received my f-one foil yet. But if f-one needs ro be more fwd then axis i will need a foil box extender.
i've heard of it, but cannot find where to buy one. Any tips?

Even if you made one, extending your mast in front of the tracks is not the smartest thing to do. The extra leverage force is magnified and it would be a lot more likely to rip your tracks out.

Maybe not practical, but putting a new box in would be best. Or even a stick on Foilmount would be better. Extending your mast in front of your box IMO.

Power plate works fine, used with 2 good quality 1/4x20 seems to last fine.
Make your own....

Good idea! Thanks