Hirobo HI0412329 4mm blade spacer 3T for SDX SCEADU SZ-5 rotor heads  [HI0412329]

4mm blade spacer for rotor heads

This spare part is an RC-scale blade spacer designed to sit between rotor blade and hub components, keeping consistent 4mm separation where required by SDX, SCEADU and SZ-5 rotor assemblies. The spacer's role is purely mechanical, providing repeatable spacing to assist blade pitch and balance setup.

Installation is straightforward for hobbyists familiar with rotor head maintenance: remove the affected blade retaining hardware, position the spacer on the blade root or shaft as dictated by your rotor design, then reassemble and torque to the original settings. Use of correct thread engagement and clean mating surfaces helps maintain alignment and reduces runout.

When tuning, this spacer helps maintain consistent blade geometry across both blades, supporting predictable pitch response and reducing asymmetrical vibration that can affect stability. Check blade tracking and rotor balance after installation and make small pitch adjustments with your swashlink or blade grips as required.