Success!
The crank's clutchside thread indeed is right handed.
Pulling the clutch with a self-made puller was much easier than expected. It came of the crank with suprising little force neeeded.
View attachment 407040
I had bougth a new .404 chain for the saw and it wouldn't run smoothly over the worn sprocket, so that's the reason why I replaced the sprocket. The old one doesn't look so bad at all but since I had NOS replacement in stock ...
View attachment 407041
New clutchdrum with sprocket installed.
View attachment 407039