Hi NormK, good news, it goes after having to deal with some really corroded screws to get to the starter ( phew!), I did as you suggested, and eventually got the starter to retract, after testing the motor first.
It over revs slightly, but that appeals to the lair in me.
I have myself a fully functioning mower that starts easily and is ready for more happy mowing .. well as soon as I replace the butchered blades. smile
Thanks for your advice.

Ahh, if only victa had kept producing the thumblatch catcher series, they would be in better shape today!