There was a thread a few weeks back regarding where to find good zero clearance inserts, not those flimsy plastic ones for the TS3612.
As I mentioned, rockler sells them. The one I first bought was the 69163 for the craftsman. Fits mine perfectly.
I just got the new grizzly catalog today, they have some new ones. The item number for theirs is H0631.
Just wanted to pass that along.