I don't thnk it's dangerous at all. We're talking way, way less than on ounce and if it did somehow come off (never has so far) the little piece of Velcro will just be lodged inide the spinner and my prop will all of a sudden be out of balance. I've tried filing the heavy side off and believe me it ain't pretty with half a hub gone. I'll stick to the Velcro.
http://www.dodvideos.com/don3.wmv
ORIGINAL: jaka
Hi!
Never ever add anything to a prop hup !!! Very dangerous when it comes flying off...!
What you do is to carefully file and sand the hub on the heavy side! This sounds perhaps to be dangerours too but most of the time you only have to remove so very little material that it will not weaken the prop.