Hi booja30, if form and function are not necessarily interdependent try to use squared ball bearings.
You're building a really dumb argument here. When you initially mentioned form in regard to this tonearm it had to be assumed that you were talking about its aesthetic. You could not be referring to its structure as clearly, its structure follows its function fairly precisely. There obviously isn't much effort going into aesthetics at this point, it's a functioning prototype.
But now you bring up a ball bearing, which has a aesthetic dictated by its function, and suggest that's the right way to do it. When that is exactly what the OP has done!