Got this in for repair today.
940 Efco/Emak with an Erico grinder attachment. Pretty cool. It's belt driven.
I had a good powerhead with a bad muffler and plugged up carburetor, so I resurected it after switching over the good parts.
Useful and neat. I could use one of those. Make sure the air filtration system is good. Just like cutoff saws they like to ingest what they are cutting... after all... everyone ends up with wood chips or metal in our pockets