Mass / LVDT The mass is shown here as the cube-like structure in the center. The stops are the vertical square bars to each side of the mass, each with a 10-32 screw for adjustment. These limit travel and keep the LVDT in its linear range. The LVDT can be seen below the mass and has three windings with yellow tape over them.

The connector to the electronics is in the foreground. The hex key at the right is in one of the leveling screws. Behind and just to the left of the right-hand stop is a black (not quite vertical) bar. This is the edge of the cylindrical ceramic magnet for the feedback coil. The thin-walled brass tube protruding from the mass is the end of the boom, and the brass suspension web extends up from the mass and out of the picture at the top.