I've always used hourglass bases w/ 2-pin cups, but when I purchased my first foil board last year, it came with a Euro Pin on a mechanical joint, which is critical for attaching the sail in deeper water. I sometimes find myself switching sails between fin and foil, so am thinking I'll standardize on the Euro Pin. I kinda like the hourglass joint on my fin board - a small, narrow 70L board that I'm afraid will flip on it's side w/ a stiffer tendon joint when the sail is lying in the water and I'm trying to waterstart, and I like the shock absorption of the hourglass, as well - but, I can't find anyone who makes an hourglass base with a Euro Pin, and I can't determine why. (I'm guessing maybe there's a risk that the Euro Pin might come unscrewed from the hourglass over time? Though there's the same danger with a cup, right? I guess there might also be an issue w/ trying to allow the joint to rotate, but I assume the pin can rotate in the mast base?)

Anyway, just curious why this is apparently not a thing!

I have always used the Boge joint and pin on my wave boards and the smaller speed boards.

The one in the picture is from Ascan, but Prolimit should have them too.
(make sure to get one with the wide safety band)

jims said..
I've always used hourglass bases w/ 2-pin cups, but when I purchased my first foil board last year, it came with a Euro Pin on a mechanical joint, which is critical for attaching the sail in deeper water. I sometimes find myself switching sails between fin and foil, so am thinking I'll standardize on the Euro Pin. I kinda like the hourglass joint on my fin board - a small, narrow 70L board that I'm afraid will flip on it's side w/ a stiffer tendon joint when the sail is lying in the water and I'm trying to waterstart, and I like the shock absorption of the hourglass, as well - but, I can't find anyone who makes an hourglass base with a Euro Pin, and I can't determine why. (I'm guessing maybe there's a risk that the Euro Pin might come unscrewed from the hourglass over time? Though there's the same danger with a cup, right? I guess there might also be an issue w/ trying to allow the joint to rotate, but I assume the pin can rotate in the mast base?)

Anyway, just curious why this is apparently not a thing!

Tendons are a bit stiffer than Boge and more likely to flip the board over in waves/swell, but once you start waterstarting they are ok.
As long as the extension rotates freely on the pin it shouldnt unscrew.
I think all the brands offer Boge/Europin. Chinook, Unifiber, Prolimit, Duotone etc.

According to Chinook it's not strong enough and prone to snapping. The tendon version is all one piece of steel and much thicker.