I have BMG manuals and an original proto-BMG Super DF'er.....
I know Russ wanted to sell the business for many years. I've not heard him in years. But I'm on the road Consulting this year.
When I get home (likely Memorial Day) I'll need to dig 'em out of my vast files and scan to PDF. Providing I can even get this listed on my honey-do list. I will place the PDF's in my RDF-USA YGroup FILES area, when I can.