Dover, that may have been a typo on your part. The SP-20 was another in their series of studio and consumer motor units. The mastering lathe model was the SP-02.
http://www.lathetrolls.com/viewtopic.php?f=1&t=1223
Huge difference. ;^)
http://www.lathetrolls.com/viewtopic.php?f=1&t=1223
Huge difference. ;^)