clamping screw
clamp screw

Mating connectors were machined pairs of brass blocks with clamping screws, attached to flying leads.

Remove the column shroud and slacken the clamping screw which holds the switch assembly to the column.

The matching adapter on the bottom of the flash unit slides in from the back of the camera and is sometimes secured by a clamping screw on the flash.

Releasing the index bar (either by releasing a clamping screw, or on modern instruments, using the quick-release button), the image of the sun can be brought down to about the level of the horizon.