Hirobo HRB-0414312 10 Hard Grip Mast Collar  [HRB-0414312]

Locking collar to keep the mast stable

This RC-scale mast lock functions as a replacement collar suitable for Hirobo Eagle Freya series items. Its hard-grip face improves hold on the main mast during bench setup, inspections and tuning while avoiding any implication of full-size aircraft application.

The design intent is straightforward: fit over the main mast to restrict axial movement so pitch and rotor geometry remain consistent while you make linkage adjustments, check bearings or change head parts. The collar focuses clamping force to help reduce slippage under bench tests and short runs.

Installation follows common helicopter maintenance practice. Slide the collar into place, align the set screw access and tighten using the appropriate hex tool until axial play and rotation are eliminated. Avoid excessive torque, run a quick spin and pitch check after fitting, and re-verify after an initial hover trial on the airframe.

The manufacturer categorises this as an Eagle Freya parts item, so confirm specific variant fit before final installation. This product is presented for hobby-scale maintenance, setup and tuning workflows.