OK seeing as I forgot to put this orange Type 13B starter mechanism back together after repairing both ends of the starter spring, I though it would be a good idea to take some pictures as I reassemble it.
All the parts disassembled (apart from rope & pull start).
Starter rope length is 33" for the 13B engine.
Starter spring fitted in the starter spring housing.
The starter reel bearing surface was oiled before fitting, then the starter reel was wound counter-clockwise to wind in the starter rope.
The starter rope fully wound in & the starter ring assembly fitted.
The (often missing) plastic starter gasket was fitted.
Card, paper or plastic spring winding separator in place.
The starter spring housing assembly was oiled inside, then carefully aligned & fitted.
The starter spring housing assembly was rotated counter-clockwise (between 1 to 1½ or 1½ to 2 turns depending on which page of of the service manual is correct, it should be obvious when it's turned enough), then one screw was fitted to the open hole and the starter rope was pulled to check the operation & return of the rope was smooth.
The winding separator was removed & all the remaining screws were fitted.
Note: the correct direction for the starter rope.
The completed starter/blower housing assembly refitted to the engine (now I could check for a spark, which was good ).
A final note: don't clean these plastic coated sticker decals with fuel/gas (they react badly).
David