Cheapest insurance in R/C...Ditch 'em at day's end. In fact, I cut 'em off EVERY time, even if I'm just changing batteries or making adjustments prior to resuming flying. Some of the older guys at my field (who must have delayed stress syndrome from the depression or something) are horrified that I'd cut off once-used rubber bands, so to make 'em happy, I save 'em for the club trainer when they're around. Otherwise, I trash 'em. I like my planes too much to risk them over something as stupid as a few rubberbands.