Hirobo HRB-0412220 - SD HPM Push-pull Lever Set (EVO.)  [HRB-0412220]

Push-pull lever set overview

This SD HPM push-pull lever set (EVO.) from Hirobo is an RC-scale cyclic linkage component aimed at model helicopter maintenance and setup. The assembly is presented as a direct replacement or upgrade option within the Sceadu parts range and focuses on accurate linkage movement and repeatable geometry for control surfaces.

The design intent is straightforward: provide a compact push-pull solution that integrates with existing cyclic linkages to influence servo-to-swash response. The SD HPM marking identifies the production family and construction approach used on the part, which helps when matching components during maintenance or tuning sessions.

Installation notes: verify linkage lengths and servo horn alignment before final tightening, use thread locking on metal-to-metal fasteners if your setup requires vibration resistance, and cycle servos through their range to confirm there is no binding. Adjust ball links and clevises to eliminate play while maintaining smooth travel.

Tuning role: this lever set is intended as a precision linkage element to support fine trim, swash geometry adjustments, and consistent control input translation. When used alongside matched servos and correctly shimed linkages, it helps achieve more predictable cyclic response during hover and maneuvering tests.

For modelers working on Sceadu-series helicopters, the HRB-0412220 lever set offers a focused way to refine linkage geometry and cyclic responsiveness without redesigning the control system.