3D Tonearm on VPI Super Scoutmaster

After buying the 10 inch 3-D tonearm for my Super Scoutmaster Rim Drive which currently has the 10 inch Classic tonearm I’ve discovered that the 3-D tonearm won’t turn on the pivot because the right azimuth knob located on the side of the tonearm strikes the VTA column. I’ve been told that the only way to fix this is to mount a new single piece tonearm baseplate under the VTA column which is slightly wider than the current one I use. Is this correct? Thanks