My apologies Mfitz73.Yes the board does have flex. I have had the board turned upside down and tried to flex it. It's like a tight spring. But beside the flex. I was running the vacuum in the workshop next to the board and the board hummed with a steady resonance like a plucked piano string. It was amazing.
Well okay, sounds interesting. I hope the vibration didnt weaken the glue job??? Looking foward to hearing and possibly seeing the board feedback.