I finished restoration on a Homelite 2000 recently which I used in the woods when I was much younger, I had stored it away and forgot about it until last January when doing some cleaning discovered it in under a pile of other useful stuff. To make a long story short, it has a well-used 1/2in X .63 chain on it. This is the reason it would not fit into my new .404 - 8T rim sprocket. With #10 stamped on drive link, I should have put two and two together.