The LVDT is the cylindrical object in the center with three yellow sections. The primary is the winding in the center, in between the two secondaries. The ends of the LVDT bobbin are glued to the perforated PCB below it, and that board is fastened to the base plate by 8-32 screws. Slotted holes and double-nutting allow alignment of the LVDT with respect to its core. The LVDT's core must move freely without touching the sides of the bobbin. The null-voltage adjustment resistor can be seen just in front of the LVDT.
Pieces of brass sheet extend down from the mass on each side as support tabs for the LVDT's core. The screws glued to the ends of the core extend out of the center of the bobbin and attach to these tabs with double nuts to allow centering.