Good luck with your Graflex 3a. I have one as well I bought last year, though the shutter is jammed and will need servicing. I have dreams of adapting it to use with 120 film. Let us know how your camera works out.
hi sharpnikkor
well, its been a handful of years sorry i didn't respond to your post sooner. i have and use my graflex 3A all the time, and love it !
i don't use 122 film, although a nice appugger mailed me some ( and i donated $$ to a local food bank ) i never used it ... instead i have
hand rolled paper that is the same width as 122 film on spools and shot paper negatives with it. i have tried to figure out the " how many cranks to the next frame"
but i sometimes get overlapping stuff, and big gaps between frames, but that's ok: the paper is all expired and i don't really care too much if i make mistakes ...
the paper is taped together after it is cut and i leave it wound on a spool for a few days before putting it into the camera ... then when i am done, i un tape and process the 8" x.. strips
it works great ! i also put 5x7 sheets of paper in the back and it puts a perfect image on a 5x7 sheet of paper. the aspect ratio i think is my favorite, its almost perfect ( not sure if there is a perfect )
also, my shutter well, it works, but i leave it OPEN and i made a lens cap and just remove it and replace it to make my exposures. its paper and expired ( read slow ) so it works great

a few examples of what i have done are attached ...
i hope you got yours in working order ! if not, apug member shutterfinger does fantastic work with graflex cameras !