Flaming River Column Disassembly

[lkt1954]

I trying to disassemble the flaming river column mounted in my 70 C10, to get shifter lever spring out that dropped inside the housing.

I'm to this point in the tear down and can get no further. I removed the pin that was in the upper right hand corner and two allen screws where the circles are and and with a gear puller I can't get it to budge more than maybe 1/2".

Do I need to disconnect the steering shaft, am I missing something here or have I totally screwed up?

Thanks