An on-load tap changer comprising: a bypass switch assembly comprising: (a.) a pair of bypass switches (68, 69), each bypass switch comprising: a fixed contact; a movable contact assembly comprising: a contact carrier; a plurality of contacts at least partially disposed in the contact carrier, each of the contacts having a first end portion with a notch and a second end portion with a mounting opening extending therethrough, the mounting opening being defined by an interior surface of the contact, the interior surface comprising a flat portion and an arcuate portion; wherein the contacts are arranged in a stack such that the notches align to form a groove and the mounting openings align to form a mounting bore; and a mounting post extending through the mounting bore such that the contacts are pivotable about the mounting post; and (b.) an actuation assembly connected to the bypass switches and operable to pivot each bypass switch between a closed position, wherein the fixed contact engages the contacts and extends through the groove, and an open position, wherein the fixed contact does not contact the contacts; and wherein in each bypass switch, the flat portions of the contacts move over the mounting post during the pivoting between the open and closed positions, thereby causing the contacts to move longitudinally relative to the contact carrier. a bypass switch assembly comprising: (a.) a pair of bypass switches (68, 69), each bypass switch comprising: a fixed contact; a movable contact assembly comprising: a contact carrier; a plurality of contacts at least partially disposed in the contact carrier, each of the contacts having a first end portion with a notch and a second end portion with a mounting opening extending therethrough, the mounting opening being defined by an interior surface of the contact, the interior surface comprising a flat portion and an arcuate portion; wherein the contacts are arranged in a stack such that the notches align to form a groove and the mounting openings align to form a mounting bore; and a mounting post extending through the mounting bore such that the contacts are pivotable about the mounting post; and (b.) an actuation assembly connected to the bypass switches and operable to pivot each bypass switch between a closed position, wherein the fixed contact engages the contacts and extends through the groove, and an open position, wherein the fixed contact does not contact the contacts; and wherein in each bypass switch, the flat portions of the contacts move over the mounting post during the pivoting between the open and closed positions, thereby causing the contacts to move longitudinally relative to the contact carrier. (a.) a pair of bypass switches (68, 69), each bypass switch comprising: a fixed contact; a movable contact assembly comprising: a contact carrier; a plurality of contacts at least partially disposed in the contact carrier, each of the contacts having a first end portion with a notch and a second end portion with a mounting opening extending therethrough, the mounting opening being defined by an interior surface of the contact, the interior surface comprising a flat portion and an arcuate portion; wherein the contacts are arranged in a stack such that the notches align to form a groove and the mounting openings align to form a mounting bore; and a mounting post extending through the mounting bore such that the contacts are pivotable about the mounting post; and a fixed contact; a movable contact assembly comprising: a contact carrier; a plurality of contacts at least partially disposed in the contact carrier, a contact carrier; a plurality of contacts at least partially disposed in the contact carrier, each of the contacts having a first end portion with a notch and a second end portion with a mounting opening extending therethrough, the mounting opening being defined by an interior surface of the contact, the interior surface comprising a flat portion and an arcuate portion; wherein the contacts are arranged in a stack such that the notches align to form a groove and the mounting openings align to form a mounting bore; and a mounting post extending through the mounting bore such that the contacts are pivotable about the mounting post; and wherein the contacts are arranged in a stack such that the notches align to form a groove and the mounting openings align to form a mounting bore; and a mounting post extending through the mounting bore such that the contacts are pivotable about the mounting post; and (b.) an actuation assembly connected to the bypass switches and operable to pivot each bypass switch between a closed position, wherein the fixed contact engages the contacts and extends through the groove, and an open position, wherein the fixed contact does not contact the contacts; and