As
@Mr Vic pointed out, you can take an ordinary file and smooth out your tool rest. I did that with a similar cast iron tool rest for a while. When I got tired of filing the dings out of my tool rest, I bought a couple of Rockler's tool rests, and I like them.
https://www.rockler.com/rockler-lathe-tool-rests
That said, I wish I had known about Rick Herrell's tool rests at the time I bought the Rockler ones. I would have bought from Rick instead of Rockler. The Rockler tool rests have a hard steel rounded (wire type) top, but I like Rick's designs better.
Whatever you buy, be sure that the post fits your lathe.
Very sure. Some tool rest posts come close to fitting a given lathe, but don't.