This is an RC-scale aluminum 23T servo horn designed for TRX4 steering assemblies, supplied by GPM as part number TRX4023TA/3H. It replaces the stock horn to provide a firmer connection between the servo and steering linkages while using an internal spring to absorb shocks and protect the servo gearset.
Manufactured from aluminum 6061 T6 with a straight-arm profile, the horn aims to keep weight low while improving bending resistance at the output arm. The built-in spring cushions impacts that would otherwise transfer directly to the servo, and multiple positioning holes give flexibility for tie rod geometry and throw adjustments.
Note on installation: because the unit uses an internal spring its overall thickness is greater than a thin alloy horn. On TRX-4 models installed in the original servo location, the support tie rod angle should be reversed to provide clearance; this change does not affect the position of the front reverse steering gear.
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