次回この記事の日本語版を投稿します。
As mentioned in Workshop I have moved and I am in the long process of getting settled in. In Workshop (1) I gave the workshop a heart by restoring on old bicycle shop clock. In Workshop (2) I gave the workshop a torso by building a workbench. In Workshop (3), I gave the workshop extremities in the form of tools, and, in Workshop (4) I gave the workshop a right hand by adding a Blacksmith vise. In this installment the workshop will receive a left hand.
The left hand, like the right hand, is also a vise designed specifically for bicycle shops and is known in the bicycle industry as a frame or pipe vise. 
Left side has two holes.
Top has two holes.
Right side has a single hole.
Here is the back half of the vise. The grooves allow the frame to be held vertically, horizontally or diagonally.
Below is a similar vise taken from a Hataya catalog.
(Refer to Workshop (3) for more on Hataya) 
Here we see the mating surface, the back half on the left and the front half on the right.
Frame held horizontally.
Frame held vertically.
Frame held diagonally (right side up).
Frame held diagonally (upside down).
And there they are, the left and right hands on the workbench.