[Gaz64]

A device like that will show the heavy spot at 6 o'clock but it doesn't tell you how much to take off, bit of "hit and miss".

Before you know it, you have holes everywhere and it may be not correctly balanced. A small "true" imbalance of 5 grams may not allow the unit to rotate due to friction in the bearings.

Personally I wouldn't trust a device like that, I value my feet too much.

I would still get the flywheel/pressure plate balanced as an assembly including the pressure plate fasteners, with indexing marks for future disassembly.