I'd be interested to hear what VPI and Fremer have to say. My HW-19 started out in life as a MK III. I then did what the dealer said was a TNT upgrade which consisted of the heavy black platter, new bearing and the SAMA in the round, silver colored casing. If I remember correctly this was before the MK IV came out and VPI called it a TNT Jr. They later came out with a different table they called the TNT Jr. I too have been disappointed with the VPI power supplies. Unfortunately, Phoenix went out of business about a year ago and they can no longer be found. Very nice base you made. I've considered doing the same but with a large butcher block. I've just never gotten around to it.
Cheers
Cheers