Not sure if the balance shaft bearing is the same as the item they have already replaced once before...
However I was pretty sure that they told me that they replaced a ceramic bush on the shaft.

As stated before this lasted approx 50 hrs before the noise returned.

Engine is being looked at again as I write this. Unfortunately based on previous experience. If the bush is replaced again the outcome will probably not be known for some time.

The question has to be asked why is this bush drying out or destroying itself ???

If it wasnt for this issue it would be a brilliant engine. Economical heaps of punch. Crossing bars has so much grip and power. Very quiet when the squeel is not present.