Lister CS6 flywheel wobbles

Hi, I wonder if anyone has a solution to my problem
Startomatic with the heavier flywheels and the one with 2 grooves to run generator has a problem.
The shaft is 50.4--to 50.8 in diameter, but the hole in the flywheel is bigger. Previous owner had 'solved' this by putting 2 hacksaw blades ontop of one another in the keyway and then hammering {with a lot of misses} the key home. True the flywheel no longer wobbled, but as it was now off centre the result was a CS 6 trying to walk out the door. Quite unnerving.
I can get it bored, sleeved and a  new keyway spark eroded but its a tad expensive at £5-600.
i also need a 3kw generator to go with it.
Or maybe it would be easier to buy a Startomatic and sell this engine.

Any thoughts?

Would dynamic balancing be cheaper than the sleeve route? - http://www.dynamicbalancing.co.uk/

Is the shaft the correct size and round if so I would be looking out for a replacement flywheel, you'll pick one up for buttons,

Chris

Chris I bought one for a few buttons unseen.Its worse than mine
Tell me where you've seen one for buttons or more
Antony