Buy some scrubby yarn from whoever sells it.
Diana uses her SK860, I'm using my LK150, both 6.5mm machines.
15cm tail is about that is needed each end.
T1 or higher, it doesn't matter because I think T8 is too loose.
bring all needles into work
knit to RC30
Take off by threading 15cm end through all the loops
Pull both cast on/off ends and firmly tie the ends together
Sew outsides together, purl side out, to form a circular disk.
Perfect project for any beginner and I'd guess that perhaps working EON on a standard machine MIGHT be doable, but certainly a bulky would do it just fine, but at a lesser stitch size, of course. Both these alternative would need a tweek. And if I was doing these on the KX350, then I'd maybe, do T7, that sounds about right to me.
If none of that makes any sense to anybody else, Here's Diana's Video with an excellent explanation of all the steps.