Jonsered :
I milled the case on a rotary table, to get the radiused surface .5 mm larger than the prop shaft. I also made a phenolic carb mount
that is rotated to get a straight throttle linkage, and a radial mount that is sandwiched between the case halves. Rear end of shaft was cut away. Reduced thickness of cylinder spacer to 1mm.
Dont remember the saw model#, and there maybe different versions, but it makes for a light , and strong engine, with some work. My turns an APC 20x10 at 7500, and Menz 20x10 at 6700.

Lars