TM 10-3930-669-34 15-7.  MAST PRIMARY CYLINDER REPAIR (CONT). (2) Position  drain  pan  under  mast  primary  cylinder (1). (3) Install two screws (2) in end of base (3). WARNING Use  extreme  care  when  removing  or installing   lock   wire.      Lock   wire   is under    tension    and    can    act    as    a projectile    when    released    suddenly. Ensure proper eye protection is worn to prevent injury to personnel. NOTE A bar may be used to rotate base left or right until end of lock wire appears in  slot  on  cylinder.    Lift  up  lock  wire end,   rotate   base   and   position   lock wire    end    on    outside    of    cylinder, rotating  base  until  hook  end  of  lock wire is exposed in hole of base. (4) Remove lock wire (4) from base (3) and cylinder (1).  Discard lock wire. 15-46