If your blade grips are tight, as far as the blades can center themselves while spooling up, you are good.
What tony said is very good for both centering of blade and kind of taking the load off the head in a crash. Tight blade grips will shred your blades (that happens anywaz) and also your spindle, your blade grips and main shaft. While.. looser (but just tight enough) blade grips will break your blades, and may be bend a shaft.. It saves the spindle, and blade grips..
I run the blades tighter than usual cause I am on higher head speed now, and I can sometimes see my blades lag behind the grips. but when I crash I see the damage.
