I was unable to complete my gearbox change as I found that the motor output shaft gear was totally worn. I abandoned the project as buying a motor would have taken the overall repair cost too high. I ended up recycling the Virtuoso grinder parts. I am left with the new conical burr set that I can not return as they were final sale…
I ended up buying another new grinder.
Be careful not to buy too many parts at the same time as they are final sale. Better go progressively.