Foundation support pier with shaft distal end edges having different length forward and reverse torque transmitting portions

A support system for a building foundation, the support system comprising:

• a support pier comprising a first shaft and a second shaft sized and dimensioned to support the building foundation from a below ground location, wherein each of the first shaft and the second shaft is a hollow steel shaft comprising:
• an elongated hollow shaft body having a uniform outer circumference;
• a distal end edge integrally formed on the elongated hollow shaft body without changing the uniform outer circumference, wherein the distal end edge comprises:
• a first forward torque transmitting edge portion having opposing ends and a straight end-to-end length;
• and
• a first rearward torque transmitting edge portion extending from and obliquely oriented relative to the first forward torque transmitting edge portion, the first rearward torque transmitting edge portion having a sloped end-to-end length;
• wherein the sloped end-to-end length is greater than the straight end-to-end length;
• and
• a coupler sleeve surrounding the distal end edges of the first and second shaft, the coupler sleeve configured to maintain a forward torque transmitting relationship and a rearward torque transmitting relationship between the first shaft and the second shaft in the installation of the support pier.