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Your 55# Harbor freight anvil can be upgraded by attaching a piece of hard steel plate (1/2"-1") to the top. It's a mediocre quality cast now, the hard top plate would make it much better, I did it to mine. I've since bought a larger (115#) anvil with a forged top surface and horn, I got a good deal from a Craigslist seller. Good luck
Nice execution, especially the price, I try to use as much cheap, free and leftover materials as possible. It's amazing what you can accumulate and trade with friends and selective trash picking. I recently found a sheet if 1/8 copper sheet 4x4' standing out on recycle night!