From an 8 chain thru: All Pass Thru; all Single Wheel (Partner Hinge & Roll); all Veer Left; then outsides (trailers) move ahead (about 2 steps) to form columns with the leaders (who do not move). (This is the same as Pass Thru, Vertical 1/2 Tag.)
This definition is from SCVSDA Note Service by Bill Davis.
It is provided here for informational and educational purposes only.