I usually move my plane in and out of the hanger by grabbing the "handle" on the rear port side of the fuselage. However, from time to time I grab two of the propeller blades close to the hub and pull it out of the hanger. I got to thinking about this and wonder if I could do any damage to something internal by "towing by the propeller". My plane is in the trigear configuration so it follows the nose wheel easily. If I'm pulling it around, should I be using a nosewheel towbar? What's the knowledge base here say?