I don't know if they changed it, but the original prop stud was kinda brittle. Broke a bunch of them just by overtightening. Didn't help the ones I didn't snap then by running them into other peoples airplanes. The Stainless bolt won't snap so quick. Used a BigMig in SLC for a while last year, did have the carb idle screw all the way in, but that wasn't keeping it all the way open, so I pushed the throttle open and bent the metal arm over so it don't close no more.

Lotsa power in that little engine, should be fun.