From the VPI website:
"The HR-X periphery Ring Clamp does NOT fit the Scout platters; it only fits the Aries-3, TNT-6, TNT-JR, and Scoutmaster Platters. The ring does NOT fit any older platter made with metal or lead"
http://www.vpiindustries.com/new.htm
"The HR-X periphery Ring Clamp does NOT fit the Scout platters; it only fits the Aries-3, TNT-6, TNT-JR, and Scoutmaster Platters. The ring does NOT fit any older platter made with metal or lead"
http://www.vpiindustries.com/new.htm