If I understand correctly, there is some kind of force plate in the deck? I think I would rather have chainplates and turnbuckles, but, you may not have a bulkhead in the right spot to easily retro-fit that. Would need to build knees, etc...

 

...there is some kind of force plate in the deck? I think I would rather have chainplates and turnbuckles,...

I looked up some pictures, and it looks like Beneteau has moved the tensioning system below the deck to make a cleaner look above deck. That sounds like a pretty good idea.

It seems pretty simple, and actually pretty ingenious. The cable shroud disappears through a small waterproof grommet in the deck and is attached somehow below. That puts all of the hardware below deck, where it is protected from weather and corrosion. One picture I saw shows an access panel with screws that looks like it can be easily removed for rig tuning.

Beneteau may have come up with something new and Innovative, that is an improvement over the old turnbuckle-above-deck system. I don't think I would want to change their system. I bet Beneteau has technical advisers that would tell you. You can probably buy the shrouds from Beneteau, very likely at a much higher cost than regular shrouds from a rigging manufacturer. But new mechanical Innovations, are often a dealer only item, until they are adopted by other manufacturers.

I imagine that the first production car to have disc brakes, was probably some expensive luxury car, and they could only be serviced by the dealer, until they came into widespread use in other cars.

If it's a 1993 model, that means that the system has been in use for at least 27 years. Maybe there are certain rigging companies that know how to make replacement shrouds for Beneteaus with this system. Beneteau could probably direct you to a rigging specialist in your area.

 

Sailed one several years ago when they just came out and was told that there was an shroud adjustment under a cover inside on the cabin side where the shrouds attach

 

I remember thinking that it was an interesting idea when I first saw it I have never used the system and I guess it worked but never caught on as the 265 was the only model that Beneteau made with that shroud system

 

If twisted wire shroud is passing through some sort of deck grommet... it seems that it could not be water tight. And then there's the matter of how the grommet is fitted over the wire. Without seeing their waterproof grommet design it's hard to evaluate. It would make for interior design considerations below deck.

 

Interesting that people are responding that have never seen a 265 before...

Here is an image search that may help you out. I would get a hold of either US Spars or SECO South instead of a local. They made the rigging for the boats in the US. I would check with US Spars first.