GTH

I have a Sawzall double wobble that I had to pull apart to replace the long shaft wobble and it's being very difficult to get the wobble shaft back in position to put the nut on the shaft, any tricks ideas, tips? I have tried different positions of the drive shaft and the wobble shaft, it starts into the bearing of the wobble shaft but won't advance far enough. am I just not holding my tongue right?

I have a super sawzall that has a double wobble set up and having a difficult time getting it back together so the nut can be put back on the shaft and ideas, tips?