i use the rope trick all the time on gas conversions for installing or removing prop hubs and it works fine but i would hesitate to recommend it for a glow engine that uses a cantilever crank with a big hole cut in the middle of it. in your case though it may be the only solution along with some heat on the nut. i don't think the engine has enough room on the prop driver to hold it with pliers.

once you get it fixed do like jaka says and ditch the plastic spinner, it most likely caused you problem. it prevents the prop driver from gripping the prop and keeping it from spinning. a prop should never come loose from just hand- propping the engine. the nut is just there to clamp everything together


dave