I have one that looks just like that. The label says "Elephant" if I remember correctly. I can get a pic if needed. Mine had some broken pieces, including what you are describing (table trunnion). I purchased them from Grizzly and they fit perfectly. I wasn't paying enough attention when installing my new trunnion and broke the original non broken side!!! UUGGHHH.....I think you have to tighten both retaining bolts down evenly or one side will bind and crack the casting.....