Second of two articles by Paul O'Connor explaining Peter Collingwood's shaft switching technique for weaving rugs. It analyzes the rug shown as the frontispiece of Collingwood's The Techniques of Rug Weaving, using a three-shaft threading with linking threads to join four blocks and a twill tieup. It explains how floating warp threads running through doups between empty heddles can be switched between shafts to change blocks, with a table of the switches needed. Figures include a block draft with drawdowns, a drawing of the rug and a threading draft for the switching section.