TM 10-3930-659-20 2-17. STANDARD TOOL REQUIREMENTS. a. The following are general practices regarding the use of tools: (1) Always use the proper tool kit and tools for the procedure being performed. (2) Ensure that tools are clean and lubricated to reduce wear and to prevent rust. (3) Keep track of tools.  Do not be careless with them. (4) Return tools to toolbox when finished with repair or maintenance. (5) Return toolboxes and tools to tool storage when not In use. (6) Inventory tools before and after each use. b. Some maintenance tasks may require special or fabricated tools.  The "Initial Setup" of the procedure will specify  any  special  or  fabricated  tools  needed  to  perform  that  procedure.    Use  these  special  tools  only  for  the maintenance procedures for which they are designed or called out.  If you are unfamiliar with a required tool, see your supervisor. 2-18. TAGGING WIRES AND HOSES. a. Use marker tags (Item 33, Appendix C) to identify all electrical wires, hydraulic, fuel, oil, and coolant lines, and any other parts which may be hard to identify or replace later.  Fasten tags to parts during removal by wrapping wire fasteners  around  or  through  parts  and  twisting  ends  together.    Position  tags  to  be  out  of  the  way  during  cleaning, inspection, and repair.  Mark tags with a pencil, pen, or marker. b. Whenever possible, identify electrical wires with the number of the terminal or wire to which it connects. If no markings can be found, tag both wires or wire and terminal, and use the same Identifying mark for both.  If you cannot tag a wire because it must fit through a small hole or you cannot reach it, write down the description of the wire and the point to which it connects or draw a simple diagram on paper.  Be sure to write down enough information so you will be able to properly connect the wires during assembly.  If you need to identify a loose wire, look for identifying numbers near the  end  of  the  wire,  stamped  on  a  permanent  metal  tag.    Compare  this  number  to  wire  numbers  on  the  appropriate electrical schematic. c. Identify hydraulic, fuel, oil, and coolant lines when you are taking off more than one line at the same time. Mark tags with points to which lines and hoses must be connected.  If it is not obvious which end of a line goes where, tag each end of the line. d. Identify and tag other parts as required by name and installed location. 2-9