I managed to remove the sprag clutch from the crankshaft by carefully prising it off, when the flats are, with 2 tyre levers, use simultaneously. It came off quite easily. I opened the unit by bending back the 2 tabs on the cover plate and slowly knocking off the cover. That was quite tricky. The inner bearing has 22 lop shaped bearings inside. My unit the spring/bearings were skewed to the side and is not repairable (as far as I can see). Luckily Burian can supply the inner bearing at 91E. Hopefully I should have a working starter again in a few weeks.