This is an RC-scale blade holder bearing collar intended for use with Hirobo helicopter blade holder assemblies. The part functions as a locating and retention sleeve around the bearing area, helping secure the blade hub while allowing the bearing to rotate freely under load.
Designers and modders use this collar where precise bearing seating affects blade tracking and pitch response. In routine maintenance it is a low-cost replacement item for worn or loose collars that can contribute to excess play or uneven blade runout.
Installation notes: confirm the bearing is fully seated in the blade holder before fitting the collar, clean mating surfaces of debris, and slide the collar into position without forcing it to avoid deforming the bearing races. After fitting, check for axial and radial play and verify blade tracking at low throttle before flight.
Tuning role: a correctly fitted collar helps maintain consistent blade alignment which supports predictable pitch changes and smoother cyclic response, reducing the need for repeated trim corrections during setup.
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