It's a sad time, but FYI OSAGE ROOST will be pulling the plug at the end of the month. It's been a great 15 years since the start, but it's hardly ever used now and time to move on!
Well, I presume either no one knows for sure what the thin wood on the bottom of most push button calls is or just don't want to expound what it is or how thick it needs to be. I understand why some callmakers that sell them don't want to tell what they use.