I have a 1980's Cambo Wide 650 that I have been using for many years but only just got a Polaroid 405 back to use with Fuji FP-100c. The Cambo manual says the 405 is a usable back but either it's wrong or I'm just doing something wrong.

The 405 back fits fine, remove the ground glass, snap on it's a perfect fit. Only thing is the dark-slide is on the left and can't be removed because the Cambo handle is in the way. I could possibly force the DS out by bending over the handle but it would be quite a bend and risk of breaking the DS ...plus I doubt I'd get it back in.

Has anyone here used a circa 1972-1995 Cambo Widw with a Polaroid 405?
If you have what am I doing wrong, is there was way to use a 405 on a Cambo Wide?

Thanks