Hitachi TM3030 Plus Instruction Manual page 131

Approx. 1 mm 
Reference position
(0.5 ~ 1.5 mm)
Height adjustment screw
lock nut 1
lock nut 2
Figure 4.2.2-6 Specimen Height Gauge and Specimen Stub Assembly
Figure 4.2.2-7 Adjusting the Specimen Height
4 - 12