and ask someone there who may be familiar with roll backs+graflock backs to take a look at your camera &C ...
i am south of you about 1.5 hours, i'd be happy to meet with you
someplace random to take a look at your camera ( and bring my speed for comparison )
but i don't travel light these days ( i have 3 assistants i have to bring with me everywhere ) .. so it might be tricky ...
i have a feeling the back mates fine with your camera, the sliders attach to the back fine, but you aren't used to the
3rd side not being attached, so it seems-like something is wrong because all the other cameras you have used the back attaches
on all 4 sides.