Just the other day, I was thinking about those huge spindles that cable comes in, y'know, wooden and used by the power companies? Around here, they leave by the side of the road, and it is a mad dash to get the good ones. Good quality plywood on them. Small end table size all the way to "how the hell do I move this thing?" size.
What if one removed the long bolts and used the hole already there for open baffle?? I'd think the round shape might help.