My HF 9 inch grinder was a different model, also reliable. But sometimes I didn't feel safe using it. It had too much torque and weight to know I had full control over it when working in an awkward position. When I sold a
Century 130 welder, I included the grinder instead of reducing my price on the welder to what I was offered. I like the 7 inch HF grinder better.
Here are some photos where I hogged out cast iron wheel weights with the 9" grinder to adapt them for a different tractor. That grinder was a brute. No problem gouging out a few cubic inches of iron.