EMBLA EB Main Mast Retention Lock HI0304161 - Hirobo  [HI0304161]

EMBLA EB mast retention lock details

This mast retention lock is designed for EMBLA EB scale helicopters and carries the Hirobo reference HI0304161. It provides the locking interface that holds the main mast in the rotor assembly on EMBLA EB models and is intended solely for hobby use.

Functionally, the lock is used when servicing or performing preflight checks to maintain mast position while you inspect the rotor head, change bearings, or fine-tune alignment. It replaces worn or loose original items to restore accurate mast positioning.

Installation is typically performed during rotor head removal or reassembly; the lock interfaces with mast seating and retention points and helps keep the mast stable while adjustments to swash geometry, blade tracking, or rotor balance are completed.