Chip, the holes in the main body could easily be machined out a bit deeper and square with a centre cutting endmill and slugs of cast iron turned on the lathe to suitable size and pushed in with a little loctite retaining adhesive. The drill holes which are partially broken out into the tee slot would be best filled with a metal filling compound like JB Weld,Belzona or you could make your own filler with a hard setting epoxy and powdered cast iron filings. I have done both types of repair I suggest above,but whatever you do I wouldn't recommend any form of brazing/welding as it will definitely distort your mill table.......OZ.