How to keep engine from turning during leak down test
 

I will be doing a valve adjustment and leak down test at the same time on my 930. I will probably do a partial engine drop (i.e. wheels off, transmission still connected). How can I keep the engine from turning when I pressurize a cylinder? The wheels would spin and I don't have access to jam the flywheel with something.

Just as I was typing this I thought of the parking brake. Would that be enough? Have others tried this?

Either parking brake or withe tranny in gear slide a medium screwdriver into the rotor cooling fins so the handle is pressed up against the caliper. It will not turn.

I just lock it at the crank. Make sure to turn up the air slow too don't just plug it in full pressure.

How do you lock it at the crank?

Socket and bar on the pulley nut if I'm doing the 912 hold the prop if I'm doing the plane. Key is to get it right at the top and not off either way or she'll take off on ya.