The standing frame 12 is secured to the base 11 utilizing the set screw 25, and the substrate 15 is then mounted in position onto the base 11 so as to cover {HEAD ~ the central opening} 21 and be in full engagement with {TAIL ~ the registration surface} 22 
The standing frame 12 is secured to the base 11 utilizing the set screw 25 , and the substrate 15 is then mounted in position onto the base 11 so as to cover { HEAD ~ the central opening } 21 and be in full engagement with { TAIL ~ the registration surface } 22
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