Hi catman,...thx for the ceramic bearing & grease lube info..my issue is with the crankshaft radial twisting distance control between the 2 main bearings between the 2 flywheels. It seems to more related to the multi-piece needle bearing cage on-axis twisting movement control which a simple 1 piece bearing or bushing doesnt allow. Any needle roller or Ball bearing type which allows bearing cage pivoting twist movement might not effect any desired improvement. I don't know if a pair of ball bearings will significantly improve that or not but it is almost totally eliminated by a pair of simple, 1 piece bushing or bearing type.