EMBLA EB Main Mast Lock HI0304161 by Hirobo  [HI0304161]

Main mast locking part for EMBLA EB

This is an RC-scale main mast lock made for the EMBLA EB series, supplied as Hirobo part number HI0304161. It functions as the retention piece that secures the main mast into the rotor assembly on EMBLA EB model helicopters, intended for hobby-grade model use only.

In everyday use the lock holds the main mast steady during routine servicing and preflight inspections so you can check the rotor head, change bearings, or carry out alignment tasks. The component is intended as a direct replacement when the original lock shows wear or allows mast movement.

Fitting is normally carried out when removing or reassembling the rotor head; the lock engages with the mast seating and retention points and helps keep the mast stable while you adjust swash geometry, verify tracking, or balance rotor parts.