RC Helicopter Linkage Needle Pin 4 x 15.8 HI2509011 by Hirobo  [HI2509011]

Adjustment Pin 4 x 15.8

The Hirobo HI2509011 needle pin at 4 x 15.8 is intended as a compact pivot and retention item for helicopter control linkages and small rotating parts. It acts as a simple mechanical fastener for short shafts, linkage ends and sub-assemblies typically involved in model setup and tuning.

Fitment is straightforward: align the holes on the arm or link, insert the pin through the shaft or hole, and secure it with the appropriate clip or retaining method used on your model. This part is meant for routine replacement during tuning and maintenance rather than as a structural enhancement.

For tuning, a properly seated needle pin helps preserve control geometry and repeatable responses when adjusting tail and cyclic trims. Having spare pins on hand makes quick on-the-spot changes easier during setup sessions.