Glass bead the problem area. Make a round plug (teflon would be good) for the center hole so it acts like a dam. The get some Devcon steel putty and fill in all that ugly. Wait a day, then draw file it flat. The Devcon steel putty looks very close to cast iron in color. It’s not a perfect repair, but no repair will be perfect. It’s easy, works and looks darn good. I have Devcon repairs on a few machines, they look so good I don’t even think about it anymore…Good Luck, Dave.
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Sure, the pic above has a mechanical pencil pointing at a Devcon repair where there was a hole. I did the repair about 10 years ago. It’s even harder to see now. I guess because the scratches from table use has camouflaged it some. It's about 7/16" in diameter…Dave