Saab 96 , Unlock

Unfortunately, I didn’t find the right Rubrick for Saab 96…. out of it I have the reverse gear in, and at the same time put the ignition key on L, now nothing goes out, neither the gear out, nor the ignition key can be moved. As far as I know this is a kind of immobilizer, and there was some trick to unlock, but unfortunately I don’t know what it was like, because it was forever ago when I had the problem. Second problem: the drive shaft is built away from the gearbox on the driver’s side, (maybe something was crashing away?) how do I best do that, I suppose: Build the wheel and wheel bearings away, is that just plugged in? or do you need special tools? And another question: is the freewheel with the inserted or pulled out lever as freewheel?