TM 1-1500-204-23-1 NOTE Type  AN943  internally  threaded  rod ends   are   equipped   with   a   witness hole     a     short     distance     from     the threaded    end    to    ensure    adequate thread   engagement   when   installed on  an  externally  threaded  rod  end. Proper thread engagement is ensured when threads of an externally  threaded  rod  end  can  be seen    and    a    piece    of    safety    wire cannot  be  passed  through  the  hole. If   you   can   pass   a   piece   of   0.020 safety wire through the hole, the rod is not screwed in far enough 3    Install    tube    assembly    with correct bolts, nuts, and washers NOTE When   connecting   a   ball  beanng   rod end,   install   a   plain   or   countersunk washer,  MS20002,  of  appropriate  size under the attaching nut and bolt head to  prevent  any  possibility  of  rod  end slipping off over the bearing retaining nut  or  bolt  head.    Attaching  nut  and bolt  must  clamp  tightly  the  inner  race of    bearing    to    face    of    washer    and supporting    structure.        Use    caution when   installing   washers   so   that   full movement  of  rod  end  is  not  limited. Nuts and bolts that are only fingertight do not use the beanng for the purpose for   which   it   was   intended.      Control tubes using clevis rod ends may have washers,   if   required,   installed   under bolt  and  nut  heads  on  outside  of  fork or  between  fork  and  bearing,  if  space permits. Tighten nuts to torque values shown in applicable aircraft manual. 4 Check for freedom of movement, full travel, and excessive side play. 5  Secure  rod  ends,  bolts,  and nuts with applicable safety devices. (6) Rod   ends.      Rod   ends   are   used   on push-pull   linkage   as   attachment   points   and   to   effect minor    adjustments.        Rod    ends    are    available    with threaded,    clevis,    and    bearing    ends.        Those    with internally threaded shanks are used on threaded control rods or control tube assemblies which have threaded rod ends  Other  rod  ends  are  used  to  make  up  control  tube assemblies Rod ends are used to make adjustments in control   tube   length   and   usually   are   safetied   with   a checknut or lockwire (a) Inspection of rod ends.  Clean and inspect rod ends using the following procedures: 1  Check for cracks and breaks. 2 Check for threaded portion for damaged threads 3 Check for evidence of corrosion. 4  Check  for  bent  or  misaligned clevis forks and elongated bolt holes 5    Thoroughly    clean,    inspect, and lubricate bearings in accordance with TM 55-1500- 322-25. (b) Repair   of   rod   ends.      Minor   repairs maybe accomplished using the following procedures: 1  Smooth  out  small  nicks  and scratches with fine abrasive cloth, Federal Specification P-C-451. 2 Correct minor thread irregularities by chasing threads with a tap or die. 3 Replace defective bearings. 4    Major    defects    will    require replacement of rod end. (c) Installation  of  rod  ends.    Install rod ends and control tube assembly as a unit.  Refer to paragraph 9-12f (5)(c). (7) Bellcranks.    Bellcranks,  as  shown  in figure   9-30,   change   direction   of   motion   and   transmit motion to parts such as control rods, cables, and torque tubes   Replace   all   worn,   bent,   or   otherwise   defective bellcranks. Figure 9-30.  Bellcrank 9-28