0025 00  TM 10-1670-287-23&P  UNIT MAINTENANCE  MC-4 RAM AIR FREE-FALL PERSONNEL PARACHUTE SYSTEM  MAIN CANOPY REPLACEMENT  THIS TASK COVERS:  INITIAL SETUP:  Material/Parts Equipment Condition Follow-Up Procedure  Personnel Required  Tools Lay out on packing table or other suitable  area. Remove pilot chute, deployment  bag, bridle bag, and bridle line. Pack Parachute (WP 0006 00) 92R (10) Parachute Rigger Parachute (Canopy), Main (Item 9, WP 0065 00)  Tape, Lacing and Tying (Item 33, WP 0076 00) Needle, Tacking (Item 29, WP 0063 00)  Shears (Item 39, WP 0063 00)  Wrench, $^{7}$/$_{16}$-IN., Open End (Item 45, WP 0063 00)  x Replace  1.  Remove risers from canopy as follows:  a.  Remove control lines from toggle rings by untying overhand knots.  0025 00-1  Upper Guide Ring Control Line Lower Guide Ring Toggle Ring Overhand  Knots