Hey - I'm watching a few Grafmatic film holders on the bay, thinking of picking one up to save bulk.

I have no experience of these, and they look really thick and chunky, so as the title suggests... are they supposed to go under the ground glass with it still in place, or should I be removing the glass first?

Silly question maybe, but the spings on my ground glass are tight - it's a nice tight fit for a normal film holder or a Quickload holder and I wonder if the much thicker Grafmatic would actually fit??

Thanks in advance