Hirobo HRB-0412220 - SD HPM Cyclic Linkage Upgrade (EVO.)  [HRB-0412220]

Compatibility and usage notes

The Hirobo HRB-0412220 SD HPM push-pull lever set (EVO.) is an RC cyclic linkage component aimed at model helicopter maintenance and setup. The assembly is offered as an upgrade or direct replacement within the Sceadu parts range and focuses on precise linkage movement and repeatable control geometry.

Its design goal is simple: provide a compact push-pull solution that fits with existing cyclic linkages to influence servo-to-swash response. The SD HPM marking denotes the production family and construction approach used on the part, which aids correct pairing during maintenance or tuning.

Fitment advice: confirm hole spacing and linkage lengths when swapping parts, secure metal fasteners with thread lock if vibration is expected, and cycle servos fully to ensure free operation. Adjust ball links and clevises to remove slack while keeping smooth travel.

Function note: this lever set is a precision linkage element for fine trim, swash geometry adjustment, and dependable control translation. Used with matched servos and properly shimmed linkages, it helps deliver consistent cyclic response for routine flight testing.

For technicians and hobbyists working on Sceadu-series machines, the HRB-0412220 lever set offers a straightforward route to align linkage geometry and stabilise cyclic inputs.