Thanks will-haggle,sadly still not the same type.
Mine is definatly a Jap C80/f engine.
The end of the main shaft has a dog screwed onto the mag.housing.
You have to push a spring loaded pin through the recoil to engage with this dog and then pull the cable.
Due to rust and alloy corrosion the recoil casting is in two bits.
It has a steel spring inside it like the old wind up gramaphones.
Pictures of the recoil starter are on the old website.
The Trac grip is a model “PB” 3 wheeled pedestrian machine. I have only ever seen a couple of Trac grip machines at rallies and these have been bigger ride one models.