This aluminum idler gear post is designed to secure the MD3.0 counter gear in RC models. It functions as a support post that positions the counter gear relative to the spur and pinion, helping maintain consistent mesh under normal running conditions.
Compatibility is indicated for the MDR-030 chassis; the part is intended as a direct spare or upgrade for assemblies using the MD3.0 counter gear. The original note lists the gear attachment part as ?5mm and a length of 10mm as provided in source details.
Installation notes: the post mounts where the original idler post is located on the MDR-030 layout, replacing the stock item without requiring chassis modification when dimensions match. During reassembly, check gear mesh and run the drivetrain by hand before powering the motor to confirm alignment.
Tuning role: swapping to an aluminum post can reduce play in the mounting compared with softer materials, providing a firmer platform for the counter gear and helping preserve consistent gear engagement during setup adjustments and typical club-level use.
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