Help wanted for HP-97 printer repair

[Kees Bouw]

Hi,

I have started to disassemble my HP-97 printer to fix the paper transport. Unfortunately I can't figure out how to remove the shaft that has the transport wheels attached to it. In the pictures you can see the current state of the printer, the position of the two wheels between which the paper is transported and the shaft ends. The shaft I want to take out (green arrow) can't be moved far enough to slide out of the opening, because the other wheel (blue arrow) is blocking it. Question is, how should I proceed or what have I done wrong?

Kees Bouw.