Hirobo HI2521048 3 x 9 x 19 Positioning Collar for Hirobo helicopter parts  [HI2521048]

Collar overview and purpose

This collar is an RC-scale accessory intended for use with Hirobo helicopter general parts. It functions as a compact positioning and spacer element that helps retain shafts and small linkages in place without changing primary control geometry.

On airframes or rotor assemblies that use standard collars, this item serves to remove endplay, hold components concentric, and provide a repeatable reference when reassembling after maintenance. The design emphasizes simple serviceability and predictable fit rather than decorative finish.

Installation is straightforward: align the collar with the mating shaft or hub, slide into position, and secure using the fastening method specified by the original assembly (for example, clamp screw or retaining ring). Check for axial movement after installation and verify control throws before flight.

For tuning and setup, use the collar to adjust spacing incrementally so that bearings and linkages run free without lateral play; small changes to collar position can affect control feel and trim, so make small adjustments and test on the bench first.