When sourcing a used shuttle loom, you must prioritize the mechanical integrity and operational speed. Key specs include the reed width (common sizes are 56, 63, or 75 inches), the shedding mechanism (tappet, dobby, or jacquard), and the RPM (Revolutions Per Minute). Ensure the motor power is compatible with your local grid and check for automatic shuttle-changing functions to reduce labor costs. Always verify the original manufacturer (e.g., GA747 series or similar) to ensure future parts availability.