Robmoney,

For what it's worth, I've been using paper clips on the plastic heads for several months, also, I have the 7.5 amp fuse on the main motor. Between the two, one backing up the other, I think it would be extremely difficult to fry a 4n1. Also, with the paper clip trick, I've never busted a main rotor or blade grips either, the paper clip snaps and saves it all. You may have seen my earlier post with picture of a pair of busted carbon fiber blade, paper clip snapped and nothing else damaged.

Dave / Choppersrule