A Sherline lathe would work well for parts of this size. Probably a bit easier to use than a mini lathe and perhaps cheaper. Definitely take less space if that is a consideration. Otherwise make jigs, as already suggested. Perhaps block of wood with a hole to guide the rod, then file along the end of the block to dress the end of the rod. Slot through one side of the block to the hole, and you can apply a clamp to the block to clamp the rod.