Thanks for all of the advice. Before I first posted here, I actually managed to mill one batch by attaching a wrench to the triangular shaft. Milled up fine but my hands were a bit banged up in the process!
I'm going to return the drill I bought and will update you on my eventual solution.
Unfortunately they don't seem to come with crank shafts anymore. Do you know how fast your drill was running? I thought the idea was that using a high torque, low speed drill it's within the suitable rpm range.
Does anyone have any experience running their millmaster (or similar) on the recommended 1050W mixing drill? The available connections are a "12.7 mm (1/2") keyed drive shaft" and a "3 flat triangular shank drive shaft designed to fit a 3/8 th drill chuck". Also, what is the small metal match...