The Stellarvue binoviewer that I have actually came with a couple of little tube tyoe things that are intended to be used if the scope won't come into focus normally. I find that I need both of them for me 12" LB. Maybe Peter at SDM sells these as an extra too. You could ask for nothing, and that would be a cheap way out.
Hey, the iews of the Moon, Jupiter and Saturn are incredible through a binoviewer. it's worth chasing up
