Bonjour Roger,
Well done, as I have no tool, I have to find a rriend who will make one for me, I agree with you, this engine is not obvious to start with the hand only.
Raphael, the only tool I used was an electric drill. I put an 8 mm diameter drill bit into the pulley, tightened the two set screws on the pulley AND added a couple of drops of CA glue where drill bit passed thru the pulley. Then I put the drill bit into the drill, locked the running electric drill in a vice and used a couple of hand files to make the cut you see in the pulley...first a coarse file and then a finer one to remove most of the machining marks. I finished with some fine sandpaper and voila...a rope start pulley after about 20 minutes of grinding.
Roger