Image Description -  0713-4

A black and white figure is shown in perspective view is 
captioned "Figure 4.  Drilling and Checking Case Clevis 
Joint Using Mastered Tool".  The figure shows a partial 
cross section of the circular mastered-tool flange and the 
circular case clevis joint of the SRB.  The figure shows how 
the case clevis holes are drilled using the mastered tool 
as a drill jig.  A long inspection pin is shown ready to be 
inserted thru the potted bushings of the mastered tool to 
verify hole alignment or concentricity.  The inspection pin 
has three diameters, with the smallest diameter at the tip 
of the pin, an intermediate diameter at the center portion, 
and the large diameter at the end.  The smallest diameter 
of the pin fits into the case clevis joint holes, and the 
intermediate diameter of the inspection pin fits in the mastered 
tool hole.