[Brian]

Yeah, obviously Scat use the same casting for the 221 crank as the later cranks. The throws certainly resemble the later castings, not at all like the nice light 221 crank. And they're obviously unaware the front and centre main bearings need to be machined wider. All good now; I machined up a 1 millimetre wide spacer to go behind the timing gear, that will space it out the correct distance, and will drop the crank off at my machinist to just kiss the faces I've machined with his crank grinder and put a nice radius on each end of the appropriate journals. I spent a bit of time with a die grinder and fettled that casting; it is now a lot smoother. I'm a bit happier than I was yesterday when I discovered this problem.