The pull string broke on my push mower.
I not sure of the make but the model number is:
Model-128802
Type - 0898-01
Code - 96072358
The name on the mower is:
Power Bloc
Large Replacement Engine.

Chris Davis, September 2006

Remove the blower housing from the engine.
Wind the pulley counter-clockwise until the spring is tight, then back it off until the hole in the pulley lines up with the hole in the blower housing. Lock it in place with a C-clamp or visegrips so it can not spin loose. Feed the new rope through the blower housing and pulley holes, and tie a single knot. Slowly allow the spring to wind the rope in. Then attach the handle.

Rick, September 2006