4 x 6 x 3 Collar for RC Helicopter Compatible Assemblies — Hirobo HI2521057  [HI2521057]

Product snapshot: 4 x 6 x 3 collar

This Hirobo HI2521057 collar is identified by the 4 x 6 x 3 sizing in the product name and acts as a compact spacer in model constructions that require that dimension. The description remains limited to the stated name and the collar's spacing and alignment role.

Installation typically involves sliding the collar onto the mating shaft or linkage that accepts a 4 x 6 x 3 collar, confirming axial clearance, and then using the model's retaining method to lock it in place. Where applicable, use the set screw or clip from the original assembly to prevent unwanted movement and confirm fitment before final reassembly.

In setup and tuning this collar provides spacing rather than a performance change. Changing its position affects stack height and endplay, so adjust stepwise and verify free movement and no binding through the control checks.