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Chimp
The Customers that drilled the third hole but didn't install the screw said that they didn't need to after a few days of riding the boards.
These boards were tested in the Australian snow pack which is at time bullet proof so it would have had testing performed on "firm" conditions. They are seasoned AK Heli travelers and are top notch riders.
What you need to remember is a normal binding has 4 screws close to the center line of the board. They would experience the same amount if flex as a std binding.
The advantage of using these solid pucks on a production board is that the voile insert layout is spread much wide than the stand 4 x 4 orientation.
This means you don't need to put the third screw in as the load is central in the puck once cut.
I would put a third screw in a DIY as the inserts are not central but as you can see it not always required.
The advantage of not installing the third screw on a DIY is that you have 4 less hole in your board.
The disadvantage is that if the puck deforms/twists or breaks in the BC you have a long skin home.
You can mount these on a solid board without cutting them in half and this allows you to use your Sparks/light Rail/Triads/FirstLight bindings on the piste.
You have the same load/stress as any std style binding using the 4x4 or 3D pattern.
The One binding system has taken it a step further and allows for angle change, where as the FirstLight puck is set and forget.
I'm stocking the One Binding system as it has its advantages and disadvantages over our solid pucks.
The Solid puck came about from Firstlight to convert the old Burton boards to Voile, the use of the puck has grow to many other options as discussed above.
All I can say is took 2 years of testing to get the right material and the right dimensions to make the puck water/snow resistant, temperature compatible and sung when used with Sparks and Light Rail.
If buying a puck like ours be sure to remember that a sung fit is hard to achieve unless they a made on a CNC machine with tight tolerances. I know Wildschnees pucks are of high quality the rest I can't make comment.

PS
I have had some questions on the install of the cant puck.
The install of this requires a Drill press or Mill that has a adjustable platform to zero out he 5 deg cant.
You can do it with a hand drill but the alignment only need to be out microns and the two board halves wont line up.


Any other questions let me know