Worked on the BurgerLUA/ARC-9 repository to deliver a feature upgrade for the TPIK system, focusing on enhancing arm inverse kinematics for improved visual fidelity and flexibility. Utilized Lua scripting and 3D math to optimize the Solve2PartIK pathway, allowing for selective bone exclusion and more efficient IK solving. Added helper utilities for bone manipulation, streamlining future development and maintenance. Emphasized code quality by simplifying core logic, updating inline documentation, and refining comments in cl_tpik.lua to support maintainability. The work addressed both performance and clarity, ensuring that future contributors can more easily understand and extend the 3D animation systems.