Lighten a 210mm flywheel ?

[Oliver Knuf]

You can lighten it on the outside diameter, no special weight written down. Just take away from the outside to the screw threads, that's it.
Use everytime you rebuild a flywheel a new shim under the srews, it's for safety. If the flywheel was screwed on without this shim, resurface the surface where the screws sit, as it's mostly damaged through that!