I just scored a deal on a Vivitar 80-200mm F/4.0 lens. I am guessing this piece is going to be big and heavy, so I will need to support the lens in some way. Is there an add-on tripod mount for the big lenses or some trick? I was thinking maybe silver soldering a nut to a hose clamp and using that, but it just doesn't seem solid enough in my mind. Thanx!