I used to use the 2 pin cup, until I swithched to the North XT extension
(which is an outstanding piece of design now that they have ironed out the bugs)
This requires the euro pin system.
I broke 2, (2 piece, sheared off, as described above) had long swims back in.
I now carry a spare euro uni attached to the back of my harness in case of emergency,
....but I've never needed it (touch wood) 'cos I also switched to the Chinook 1 piece machined pin and I also have a North 1 piece pin.
I agree with Mark about the 2 pins getting sloppy as the holes go out of round, and the plastic wears. (probably doesn't effect its performance, but it just feels dodgy)
Probably a silly question, but what does the string / or web strap do? Is it there just to stop you losing the rig if the rubber breaks?
I ask as as on mine the string has snapped.
Euro pin for me but only the Single piece machined ones, there a few around now.
Ive sheared off a couple of the older threaded types.
But the threaded pin types can vary in thread size, some brands are 8mm and some are 10mm which can make a big difference. Anyway I stick with the machine types 12mm pin for the amount of sailing i do.
But you do need to change the tendens at lest once a year maybe twice for me 
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yep exactly what Vando said.
Although the string on a tendon base can help with multiple failures, where the webbing with a boge joint only helps if the top and bottom of the joint are still intact.
With a tendon you can shear the tendon in the middle or at either end, have failure of the bolt that attaches the tendon and also partial failure of the cup that the pin or base plate attach to and the rope will still help you get back in.
With a boge and webbing, dimply due to where it all connects, pretty much anything other than the joint shearing through the middle will mean a loss of rig connection.
OMG
this thread has made me throw more questions then answers
think i am going to stick with EU pin. There alot more 2ndhad extension + base and i can get replacement pin.
So does any other brand make 1 piece steal pin , or just chinhook ?
I did broke two tendoms in euro base this season so mybe is the right time to convert to US two bolts system 
When I did last switch years ago in oposite direction I was thinking that now I am changing old fashioned technology and gear to new modern staff.
Beside the safety tape looks stronger that two thin ropes that broke all together with tendon recently -then sailing back with two separate pieces is real hassle.
Stuff breaks because it's old or damaged, just look after it and you'll be ok. I've replaced my tendon every year for the past five and have not had a problem. Just pick one and go sailing, This is looking like one of those threads that will never die....Do I seriously need to mention "powerband" again?
William, just pick one or the other buddy and you'll be fine.
Get out on the water and have fun
+1 Streamlined all the way....
When mine pin went the first time i was still harnessed into the sail and the board was unfetchable in high wind i shartbaited it to the beach (1.5 hours) holding onto the boom and sail. (amazing what you try and do with that so far out).
Second time the pin failed i managed to recover both items and used the emergency down-haul rope to wrap around the bottom of the u/j By the time i got back to shore the extension had put a 2 inch hole thru my board.
If your going out far from experience id use the cup! For me it eliminates a another element of catastrophic gear breakage thus could result in big swim.
The down side the to cup is the universal seems to go oval shape and bend To me this is a sign of fatigue and then it will require replacing.
Also the rubber grommets should be replaced each year Its a simple operation that requires (metric) hahaha 'allen keys socket set and high strength locktite. Make sure when servicing tendons you locktite the locknut and leave at least a .2 clearence on swivel.
I have posted picture of the problem previously and servicing on u/j joints but can locate the thread !
7.9mm 316 stainless round bar can take a average maximum (lift)force of 3 tonne to split. This is greatly reduced by constant dynamic (shock)loading. If there is no radius on the critical sheer point you can half it.
^^ the point is that if the pin is screwed to the cup that the tendon sits in, the screw can shear off. The screw is about 6mm and has work hardening and machine cut threadss so it is a lot weaker than a bit of 8mm stainless.
I think you have broken 2 piece units.
In the Chinook and some others the pin and cup are machined from one piece of billet which makes it considerably stronger.
Look at ikw777's pic - in the single piece europin's liek Chinook, that red line does not show where 2 pieces join - above and below the red line is one chunk of metal.
Like vando asks - has anyone broken a single piece europin? I have never heard of one
personal preference Ill never be running euro pin Junk ever again.
1 peice 2 peice 3 peice is what you be waiting for to wash up on the beach after a long swim back when it comes apart in 35 knots
Don't get the two peice eu pin cause I snapped about 4 in a row, gotta make sure you get the chinook or north or what other machined eu pins, the other crappy one are for beginners gear only, cause you will break them
I've been happy with eu pin with the tenden great bit of gear,
i have heard that you can get a CUP that fin on a normal PIN , so u can use both
but u cant get a pin that fin on a cup https://surffx.com.au/products-page/base-and-extensions/neilpryde-uxt-to-mxt-adapter/
from my understanding , the CUP has a pin that rotates . isn't it possible that the cup can sheer off the base as well ?
I had a look at a few guys base , and notice every one had the double pin on the bottom
i like the idea of the quick lock and you can take it off to travel
thinking of getting some thing like this.
ok , i was getting confussed
so the "tendon" is the rubber bit , not the rope
What are the rope bit called ? , i can see why people rather the rope over the strapping
( easy to replace with down haul rope)
with the tendon there are 2 hole ( which would be the main area where they will rip)
do the Boge rubber have 1 single bolt through the middle ?* how does it bend ?
are there any movies or web site of how to replace them so i can see how they work
sorry, cutting the grass = i heard a kiter refer to it as speed windsurfers sailing back and forth
has anyone actually Broke a single piece euro pin.
