I have a 2013 Y6 with the old style motor collets with rounded nuts that are tightened with a 2mm hex wrench. I had a crash earlier this year when a prop flew off mid flight despite me having checked the nut tightness prior to flight. Since then I have been paranoid about prop nut tightness.
I changed the nuts to regular M6 hex nuts and use a socket to tighten them. However I still find it difficult to tighten the nuts. While tightening, the sharp edges of the prop are digging into my hand while I am also trying to anchor the motor from spinning. I am sure everyone has had this problem sometime.
Does anyone have any tips for tightening props? Maybe I could find a tool to anchor the motor without having to clamp it. Possibly one of those rubber strap grip tools will do the trick. Haha maybe I have just answered my own question. Time to visit the hardware store.