So.. I'd the clutch adjustment screw won't move when the case is ON then something isn't aligned properly or something is damaged or bent.
Do you have a copy of the factory service manual at all? I would advise downloading a copy and double checking everything as you refit the side case.
I've never had the side case off a 350 but I assume it is very similar to a 300. I always tilt 300's when refitting sidecases as it allows easier alignment and keeps linkages centred. Maybe worth a try..?
Are the change clutch plates all seated correctly? Are the location tabs all flush with eachother? Did you dip the clutch plates in oil before fitting?
Do you have a copy of the factory service manual at all? I would advise downloading a copy and double checking everything as you refit the side case.
I've never had the side case off a 350 but I assume it is very similar to a 300. I always tilt 300's when refitting sidecases as it allows easier alignment and keeps linkages centred. Maybe worth a try..?
Are the change clutch plates all seated correctly? Are the location tabs all flush with eachother? Did you dip the clutch plates in oil before fitting?