I made the prop hub yesterday, and cut down the fins a little. I also made adapters to convert it to cm-6 plugs. There is about 1/8 of an inch beyond the taper of the stub sticking out. I dropped the crank at my welder this morning I will post a pic. when I get it back. I am going to put a wt-201 that I have laying around on it. I stacked everything on my scale and it will be right at 3.5 lbs when done minus ignition and mufflers.