I'd be careful around the magnets. They have a crystaline structure and may shatter? The machinist may know? Best to just be careful and get as close as you can without actually touching the magnet.

He may have to come up with a mandrel to turn the OD because they usually chuck the flywheel in a 3 jaw on the OD in order to face the fins off.

The Phelon brand of flywheel and coil are rather weak in the spark department anyway. You have to wait until after dark to see a yellowish spark. The Walbro's will give a blue spark but they are rare on a Ryobi.

The die casting having flashing over the magnets would definetly cause a greater coil spacing and a weaker spark.

The later Ryobi's with the small muffler outlet were bad about getting carboned up. Especially if you set the mixture a little richer and You have to run them wide open throttle all the time to help keep the carbon out.

The early ones with the 1/2" exhaust never seemed to have any trouble.

Jim