Joe Gwinn wrote, on Sun, 08 Feb 2015 18:32:00 -0500:

One can greatly reduce the effect by spacing the boards apart by say an
inch, which will equalize the pressure.

We're currently using a Philips screwdriver blade as the spacer between boards.
https://c4.staticflickr.com/8/7338/1...2c0d8465_c.jpg

Maybe we should use something thicker.
This is a great idea, which I will share with the bridge owner.

Thanks!