First of all, you cannot get a prop nut tight enough by using a little 4way wrench. Get you a small good quallity set of Crescent Wrench, and don't be scared to snug it down good and tight. The Stock Prop nuts are softer than the shaft, so don't worry so much about stripping the shaft. The Nut will strip before you strip the shaft, but with this said you don't want to strip either. If yo are nervous about doing it, then take a torque wrench to the field with you, and have a veteren flyer torque it down for you, and then the next time you will know exactly how far to go. I have been around several nextstars, including the one my Brother owns. It seems they all like to start backwards with that O.S engine, and that stock prop match. I actually find it easier to start his with a chicken stick backwards. Once you flip it this way, it may either start up, and run backwards or it may cough, and kick itself into running the proper direction. If it happens to start backwards just trim the idle way down to a crawl, and then bump the throttle a couple times, and then it will usually cough, and then take off in the right direction. My point is that for some reason this combination just wants to start easier in reverse than forward. So when you are using an electric starter you have the engine wanting to work in the oppisite direction that the starter is spinning, thus trying to spin your prop nut loose. Hope this helps, and good luck with your Nexstar. They are really a good flying Plane.
Ray

I used the word Channel Locks in this Post, and the word I meant to use was Crescent Wrench, so I have corrected that. I would never use a pair of plyers to tighten anything on my Plane, or a cheap crescent wrench. A good quallity one without slop works good. A Bleeder Wrench like posted below would also be good, or the proper size boxed end wrench. My field box is heavy enough, and I just like to carry as many multi use tools as I can without bringing my whole garage toolset to the field. The one thing I can't figure out how to cut down on, is the one whole drawer I have full of Allen Wrenches. It seems that all dozen of my Planes all use different size Allen Wrenches.