The sleeve drive crank is coming along nicely, sized to the inner race of the bearing. This is one of many critical sizeing operations and it’s quite stressful, knowing you can spoil the entire part if you’re out by even a thou!

After a trial fit and fine tune, we have a great push fit which feels really good. The photo shows the driving bar used to turn the piece between centres, which will house the drive pin once it’s bored to size. (Another critical dimension!).

Won’t be long before we have a component that’s completely finished!!