Years ago there was a “hack” I found somewhere online to make an Equicube: it used a large plastic container about the size and shape of the cube (I have one), filled with sand or equivalent - and with do-it-yourself handles on the sides.
Obviously it wouldn’t be a “perfect replica”, but I did see them in use in pictures, and riders seemed to derive some benefit.
I tried Google and Pinterest seemed to have a tutorial?, but they insisted I first log in, didn’t recognize my password (I already have a PASSWORD with them?), and then have not e-mailed me with a way to reset my password, despite their promises.
Harrumph.
So, anyone, anyone?? TIA!