Sort of like a craze that's doing the rounds here Fidgets, a description of an average one, a plastic square 60 mm 70 mm x 10 mm thick with an 8 mm bore bearing race in each corner, and one in the middle. I'v seen some at $NZ 2.50, and up to $NZ 10 plus. I might just get some for the bearings.
Those motors will be heirlooms in future years, something that someone in the future can say "my great granddad made that in 2017, wonder how he did it?
Ian S C