Wood props need to be check for tightness on a regular basis. By nature the wood "Gives" a bit leading to a condition other than acceptable tightness.

IMHO...NEVER use a Crescent wrench ( Slangly called a "Fitts-All" ) to tighten a prop! It's the wrong tool to use for a critical application.

Once you see how much you can really crank down on a prop, and, how much they actually need to be tightened...you will be good to go!

As far as the 4-Way wrench is concerned...if you can tighten the prop on my OS 160 with it...The drinks are on me, The arm wrestling match is over, YOU WIN!