Wow, you've got a 1-13/64" drill bit?

Of course the magic number is X.XX in-oz of imbalance, not necessarily just 3 holes of a certain size. Also, steel flywheels may not use the same size holes due to differences in the mass of the materials. I think the diagram above is only truly valid for cast flywheels, but it might be "close enough" for steel flhwheels too.

Clair