The screws were really stuck in the 015. I put half my body weight on it, gave a good twist and broke a flat blade screw driver. Grab it pro got it out. I flipped around the fuel filter, and took apart the carb which looked clean, but I still added carb cleaner. It runs well now. I hope it lasts through 4 pine trees because the bar sprocket has worn to very sharp needles, and there's a deep groove in the drive sprocket.