Hirobo HI2521144 Shaft Collar 2.6 x 3 x 2.9 for Tuning  [HI2521144]

Setup collar to aid rotor trim and runout control

This collar is supplied as an RC-scale replacement for Hirobo helicopter general parts assemblies. It is intended to locate and retain components where a tight dimensional interface is required on shafts or inside hubs. Use it as a precision spacer during tuning rather than as a major structural element.

Fitting is routine for technicians used to rotor-head and tail-rotor work: slide the collar into place on the shaft or into the mating bore, align axially, then secure the adjacent fasteners in line with the original assembly method. After installation, verify free rotation where needed and check endplay to confirm the collar sits correctly.

In tuning sessions this collar can help preserve consistent shaft placement which improves trim repeatability and simplifies swapping components. As always, confirm fit before any flight and inspect periodically for wear during maintenance cycles.