This is a great replacement for your 500 class Helicopter
Trex 500 Autorotation Tail Drive Gear: Tarot 500 TL50019
500 Class Strait Cut Main Gear (White)
ALIGN TREX 500 AUTOROTATION TAIL DRIVE GEAR H50019T BNIB
Hirobo Sceadu Rc Helicopter Secondary Gear Assembly Front Tail Drive Gear Set
Gaui NX4 RC Helicopter Main Gear Assembly With One Way And Tail Drive Gear
500 Class Plastic Tail Blade (76mm from bolt hole)
