Plunger (spindle) 2 slides along fixed guide a of the stock and holds taper-shank centre 5. Workpiece 3 is clamped between centres by spindle 2 due to the action of spring 1. Lever 4 with crank handle b turns about fixed axis A and has a head c that enters a slot in spindle 2. Lever 4 serves to retract spindle 2 for releasing workpiece 3.
$178$SL,GC$