capt,n I use to do that when I had them on the engine stand until I figured out that my 1/2" electric drill with A starter cone on the front of it was A hole lot better.I had made up a large washer with A notch in it (like the old old lawn mowers had to attach the rope) I would put the washer between the fly wheel and prop hub.It worked pretty darn good.I think you could possible do that to A engine mounted on your plane as long as it did not have A cowling and if you had some one to hold it.Might be A little ruff on the fuse though?
Thanks to all
clocknut