This Serpent SER440107 upper arm is an RC-scale replacement upper suspension arm supplied as a direct-fit component for the Mini Spyder Monster truck RTR EP (SER440001). It is offered for service and routine maintenance rather than as a performance upgrade with unverified claims.
Functionally, the upper arm locates the upper hub and helps control camber and roll centre behaviour within the truck suspension geometry. When replacing a damaged or worn arm, confirm alignment relative to the lower arm and hub carrier so steering and suspension kinematics remain as intended.
Installation advice is straightforward: check correct part orientation, tighten fasteners to the original mounting points, verify full-travel clearance, and inspect ball stud and pivot interfaces for any play. This item is described solely as an RC accessory for model maintenance and tuning tasks.
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