Thank you, Mike and Bob!
Mike, I would certainly appreciate it if you have the right plexiglass to cut and ship. If not, thank you for offering!!
Bob, yes it is lateral flexibility, not vertical. Vertically, it is very sturdy. You are absolutely right, if I left the bridge as is, it could be like the Tacoma Narrows Bridge. I have seen short clips of it galloping, but never the inclusive film you found. I'll bet they hanged the engineers off the end of the bridge that was left intact. Back when I was going to Penn Tech in Downtown Pittsburgh in 1974-76, I walked across the 9th Street Bridge (now Rachel Carson Bridge) every day. In the winter the wind howled down the Allegheny River Valley and I would look at the suspension marveling at how it kept the bridge intact. Looking down there was nothing but broken ice refrozen into a jagged landscape from shore to shore. It felt about 20 degrees colder looking down.
Mike, you are right. On the one hand resting the knee would help, but you need to keep the CEO happy. My knee hurts doing anything. The surgeon told me it is not the knee replacement itself, but the tendons that connect the thigh to the calf by running down either side of the knee cap. I guess it isn't surprising because he had to shove all that over to the side to get access to the knee joint itself. Yuck!!! Kim has to somewhat baby her two knee replacements now that she has a form of rheumatoid arthritis that actually decreases the muscle mass. It is a fairly newly named diagnosis, and I can't remember the name of it.
Yes, I can't wait to see the bridge painted too. I think I want it painted a dull silver like the single track bridge. I'll have to go down the hill to the local Ace Hardware and see what is on their shelf. Lots of colors have been missing from the shelves for quite some time.