At the moment we've got about 400 grams of metal removed from the sprag housing (pic below shows before and after machining)...
...and a hundred grams or so from the flywheel itself...
We're just making sure the balance is ok. As far as we've been able to determine we can balance to a greater accuracy, +/- 1gram, than Suzuki chose to as standard. The reduction in engine vibration over the last few thousand miles would support this but we're going to do another flywheel to check before we start selling the balanced flywheels.
The sprag housings are absolutley spot on and we can sell those now, looking at about £75 on an exchange basis for a curvy sprag housing.