Firstly, we note that all parts of the described polarimeter may be machined using a hobbyist milling machine and 3D-printer, except for the 6-mm mild steel rods which require access to a workshop for tapping of the screw-threads in each end. For those without workshop access, we describe in Fig. an alternative means of attaching the rods to the mounting plates that does not require screw-threads to be tapped into the rods. In the alternative scheme, the rod-and-plate framework is held together using steel shaft collars that thread around the (untapped) rods and clamp the mounting plates securely from each side. The collars are fixed in place using simple grub-screws. With this one change to the design -which has no adverse effect on performance -the need for workshop access is removed, and the entire system may be made using a benchtop mill and 3D printer.