How do I know when to replace my throwing arm?
This page will help you determine if your throwing arm should be replaced. Throwing arms can be inspected when the trap is in the released position, be sure the trap is uncocked and the battery clips are disconnected from the power source before inspecting or replacing the throwing arm.
When working on or around trap machines, always wear eye protection and proceed with extreme caution. Trap machines have pinch points and components that move rapidly. Safety information included in your owner’s manual must be read and understood before performing work on any trap machine.
When to replace a domed target throwing arm
Hard Polyurethane: The throwing arm should be replaced if the polyurethane part of the arm is too hard. A good rule of thumb for determining if the polyurethane is too hard is the fingernail test. Firmly push your fingernail into the polyurethane, you should be able to indent the surface without too much effort. Also, inspect the surface of the polyurethane that makes contact with the target, this surface should have some texture to it and should not feel too smooth. If it is difficult to indent the surface or it feels very smooth, it is likely time to replace the arm.
Cracking Polyurethane: The throwing arm should be replaced if the polyurethane part of the arm shows cracks in the surface. In the image below, the worn throwing arm shows cracks in the polyurethane, indicating that it is significantly degraded and should be replaced.
Bent Throwing Arm: If the throwing arm is bent, it will need to be replaced. A bent arm can cause broken targets or inconsistent target flight. The easiest way to check if an arm is bent is to use a straight edge as shown in the image below. Closely inspect where the arm mounts to the arm holder, this is the most common point for the arm to bend.
Deformed Polyurethane: Inspect the polyurethane for damage or deformations. The arm should be replaced if there are any significant points of damage or deformation to the polyurethane.