The direction that the lifter assembly moves along.
If a planar surface or plane is selected, the selected surface is assembled flush with the YZ plane of the lifter assembly.
If an edge is selected as the pull direction, the positive direction is from the start point to the end point of this edge. The point nearest the cursor is the end point. A vertical work surface is created with the selected edge in the end point. This vertical work surface is assembled flush with the YZ plane of the lifter assembly.