A wigwag in glassblowing is a straight line work often pulled one of three ways Inside out,stick stack and tube encasements. Lines twisted back and forth often one way down the tube then come back between the other way called terminations.
My friend Glass4Life making two Sherlocks (one is Rastafarian colors) tobacco pipes. I tried to show the process of making one, but was told afterwords that I cut the footage together from the creation of two different pieces. Watch glass melt.