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Figure 3-28.  Removing insert Tang
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TM-9-254 Gearcase Transfer M548 M548A1 (
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Figure 3-30.  Using Spiral Tapered Screw Extractor
TM 9-254 3-9. Helical Inserts - Continued (3) Push down on the extracting tool and turn counterclockwise to back the insert out of the hole. (4) Discard the insert.  Never reuse an insert. 3-10. Removal of Setscrews. a. General.    The  securing  of  mechanical  components  is  frequently  accomplished  by  the  use  of  setscrews. Disassembly  of  components  without  removing  these  setscrews  is  probably  the  greatest  cause  of  damage  to  fire  control instruments  during  the  inspection  or  repair  process.    Many  setscrews  are  covered  with  sealing  compound  and  paint. Some setscrews may be installed with setscrews on top of setscrews to lock them in place.  Perform an inspection of the instrument before disassembly is attempted. b. Removal of Ordinary Setscrews (Undamaged).  Examine the instrument and components for the presence of setscrews.  The technical manual for the instrument must be reviewed if there is  any  doubt  concerning  the  presence  of setscrews.    When  the  setscrew  has  been  located,  remove  paint  and  sealing  compound  with  a  scriber  or  jewelers’ screwdriver.  When the head of the screw can be seen, insert a screwdriver or Allen wrench of the proper size and remove the screw. c. Precautions.    If  the  screw  will  not  back  out  when  normal  pressure  is  applied  with  the  screwdriver  or  allen wrench, do not force it.  It may have been sealed in position with shellac or another fixing agent.  If so, apply a few drops of-alcohol to the screwhead and allow it to soak for a few minutes.  Again insert the screwdriver or hex key wrench and exert a slight back and forth pressure.  It may be necessary to apply heat to the area around the setscrew to loosen the sealing compound in order to remove the setscrew. d. Removal of Damaged Setscrews.  If the slot of a setscrew below the surface is damaged, the best method is to drill out the screw and retap the hole. (1) Select a tap drill of the size for the setscrew which will be used as a replacement. (2) Position the part to be drilled securely on the drill press with the drill centered on the setscrew, and drill out the setscrew. (3) If the setscrew is not too small, it may be possible to remove it with a screw extractor (fig. 3-30). (4) Another method of removing setscrews is by using an insert extractor tool of the same size that will fit the screw opening, as shown in figure 3-29. (5) If  the  setscrew  is  above  surface,  it  may  be  possible  to  slot  it  sufficiently  with  a  small  file  or  hacksaw blade (fig. 3-31). (6) A setscrew that can be turned, but which does not back out, indicates a stripped thread condition.  It may be possible to back out the setscrew if the parts held together by the setscrew can be turned enough to put a slight stress on the setscrew.  This will allow those threads still undamaged to engage and enable the repairer to remove the setscrew. 3-29

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