im definitely talking about the DIY type (a) II.
thing is, amostay, if you have it loose like i do, the ridges just collide head on which means it locks up incredibly badly, and i hate tight cubes. so if you set it loose, sanding down the edges means they just slide past each other. and the stretchiness of the springs and the hardness of the cubies means that it makes an awesome OH cube and a very good 2H cube.