Yes, very impressive setup. I noticed he must have had the flywheel loosening problem. Looks like he machined/cut a slot in the crankshaft and flywheel, then locked them together with a square key. A very correct way to solve the problem. But a simpler solution is to file/grind/mill flat spots on the crankshaft where the set screws contact it. I did that on my M90 and it works so far. Upon disassembly of my M91, I noticed the factory is now machining flat spots for the set screws, albeit very small flats. You have to be real careful to get the set screws on those tiny spots upon reassembly.