Duster Shakes on take off

O.K. first I ask if it was a sintered disk and said nothing about iron!
Sintered meaning material such as copper, iron, steel, ceramic compressed into a shape, And this is not helping the OP question. Is the flywheel iron or steel, has it been surfaced, and yes if the disk has oil on it there is realy no good way to get it out. Good luck 76duster.