fixed. An adjustable scriber produces letters with any slant from vertical to 22 1/2 degrees forward from a single template; a fixed scriber produces only  vertical  letters.  Both  scribers  consist  of  a tracing pin, pen socket, socket screw, and a tail pin.  Figure  3-59  shows  a  fixed  scriber.  The tracing pin on most Leroy scribers is reversible, One point is used with fine groove templates (Nos. 060, 080, and 100), and the other point is for wider groove  templates  (No.  120  to  No.  500). LINE  WEIGHTS Recommended combinations of template and pen for best proportion between line thickness and letter size are shown below. Template  No. Pen  No. 060 000 080 000 or 00 100 00 120 0 140 1 175 2 200 3 240 3 290 4 350 4 425 5 500 6 This  list  is  also  found  inside  the  lid  of  the Leroy lettering set case. OPERATING  PROCEDURES A certain technique is required to manipulate the   Leroy   scriber   with   the   template   and,   at the  same  time,  hold  the  template  against  the working  edge  of  the  T  square  or  straightedge without  slipping. The T square or straightedge must be held in position  with  the  ball  of  your  left  hand  resting on  the  blade,  while  the  fingers  of  the  left  hand hold the template against the working edge and change  the  position  of  the  template  when necessary. The scriber is held between the thumb and first three fingers of your right hand. The little finger of the right hand presses the right side of the  template  against  the  working  edge,  preventing the tracing pin from slipping out of the character grooves  of  the  template.  Care  must  be  taken  to keep the tail pin in the straight-guide groove at the  bottom  of  each  template.  When  you  are making long lines of large lettering, you may find it helpful to secure the T square or straightedge at both ends of the drawing board with drafting tape. Using  the  above  techniques  to  manipulate  the scriber  and  template,  follow  the  steps  listed  below to form uniform letters, words, and sentences. As you  follow  the  steps,  refer  to  figure  3-59. 1.  Select  the  template  with  letters  of  the desired   height. The   distance   between   each graduation at the bottom of the template is equal to the height of the letter that can be made with the  template.  The  numbers  in  a  fraction  are  made by  using  a  template  one  size  smaller  than  that used  for  whole  numbers. 2. Lay the template along the top edge of a T  square  or  straightedge. 3. Using the table of recommended template and  pen  sizes  previously  mentioned,  select  the proper  pen  to  give  a  well-proportioned  letter. NOTE:  On  drawings  with  a  great  deal  of lettering, the recommended combinations may be altered by one pen size, either under or over the recommended size, for variation and appearance. Never  use  a  pen  size  more  than  two  over  the recommended  size. 4. Insert the selected pen into the socket of the scriber arm until the shoulder of the pen rests on  the  scriber  arm. 5. Tighten the screw on the side of the scriber arm. 6. Loosen the locknut on the adjusting screw in the scriber arm. 7.  Set  the  tail  pin  of  the  scriber  in  the straight-guide  groove  of  the  template. 8.  Set  the  tracer  pin  of  the  scriber  in  the groove  of  a  character. 9.  Lower  the  pen  gently  to  the  drawing surface. 10. Raise or lower the scriber arm by turning the adjusting screw until the tip of the cleaning 3-39