Oh yeah - I did know about the stopper. Thanks for reminding me!
So sounds like you're talking about a "test stand" for breaking in the engine. That is good info, but I'm wondering about what else I need inside the plane - if anything.
I could be out of luck with the "strong arm". may have to hit the gym

Not enamoured of the idea of hand-propping. I know how my luck goes! Any problems using a chicken stick?