So I just acquired a saw back from and Old friend this week. One that I sold him some years back . It's a nice Echo cs-520 ! Still runs great ! When I had it...I converted it to 3/8 and put a 16" bar on. Runs in really well ! Great standout saw model (510,520,530) from echo...from a time where most of there other saws were lackluster in performance for the most part. Im sure I'll catch flack for saying that lol ! Can't wait to get it out..and get reacquainted with it !!!