That is a great vise, and in nice shape! It is common to try to kill the ring of anvils, but I never thought about doing it with a vise.
This is my 608 Columbian that came from Washington state that replaced my 6 inch stationary Columbian. I'm short on room so the swivel feature is a luxury to me even though the stationaries are stronger vises. By comparison the 608 is about the same size as my 208 Reed, 31 1/2" long, and 14 1/2" high, but 111lbs. lighter. The Reed has no voids in the static and dynamic towers, but the Columbian has huge voids. So I filled them with lead, that's right lead. I slowly heated each tower so not to cause temperature shock to the metal and then I melted wheel weights and babbit led and poured it in. It took 40lbs. of led to fill the voids. Now when you peck on the vise, what used to sound like ringing a bell, now sounds like a dead blow hammer. Didn't do it for the weight, did it so not to crack or knock a hole in in a good vise.[/QUOTE]