Hirobo HRB-0412220 is an SD HPM push-pull lever set (EVO.) designed for use in RC-scale cyclic linkages and intended to support routine maintenance and setup tasks. The assembly is offered as a direct replacement or upgrade option for Sceadu series parts and targets accurate linkage articulation and repeatable control geometry.
The unit is engineered to be compact and to integrate with existing cyclic linkages to refine servo-to-swash response. The SD HPM designation identifies the production family and construction approach for easy part matching during repairs or tuning.
Installation notes: check linkage lengths and servo horn alignment before final tightening, apply thread locking to metal fasteners when vibration resistance is required, and move servos through their full sweep to confirm smooth, bind-free travel. Adjust ball links and clevises to remove play while keeping fluid motion.
Tuning role: the lever set serves as a precise linkage element to help with fine trim, swash geometry adjustments, and consistent control translation. Used with matched servos and properly shimmed linkages, it promotes predictable cyclic response in hover and flight tests.
For modelers working on Sceadu-series helicopters, the HRB-0412220 lever set provides a focused method to refine linkage geometry and cyclic feel without redesigning the control layout.
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