No home made or other mod's on my HBird other than separates, smack the couch and there goes another main blade right at the root. on the other hand over the hedge (Corona) into the neighbors dogwood at 4 feet high clip off a branch as big around as my pinky and straight down onto the tail nose pointing skyward just a slightly bent tail boom and leaf stains on the mains was flying again 1/2 hour later no parts