The title says it all. I've loved the TNT table since I bought it around '94, and it's still stock, although I do use it with an SDS. I tried the squash ball update and wasn't impressed. Can any of VPI's recent feet be adapted to the TNT without making a kludge of it?
The cap screw affixes to the tower that holds the feet. You'll need to remove whatever hardware is there now by using an allen wrench, and it will simply unscrew.