Hirobo HI0307026 Counter Gear 21T for Eagle Freya EX-EP Helicopter  [HI0307026]

Counter gear role and fit

This 21T counter gear is an RC-scale replacement part specified by the product name for the Eagle Freya EX-EP line. It is intended as a drivetrain component inside the model helicopter transmission where correct tooth count and mesh affect tail and main rotor behaviour.

In practice this gear is used when restoring tooth geometry after wear or when swapping parts during rebuilds. Fit checks should confirm tooth engagement, axial alignment, and free rotation before final assembly to avoid binding or premature wear.

Installation notes: verify hub orientation and clearance with the mating spur and pinion gears, inspect bearings and shafts for axial play, and use correct fasteners to secure the gear without altering gear mesh. This description treats the component as an RC helicopter part only and does not imply real-vehicle use.