Hi, I've taken the top end off my 181 to inspect some piston scoring I could see through the exhaust port and wondered if anyone could offer a second opinion if they're reusable?! I've cleaned them up with some emery and scotchbrite and there's definitely scoring on the piston. The cylinder feels smooth to the finger but using a fingernail does encounter very slight roughness on the section around the exhaust port. I can't tell if it's scoring or transfer! I'm leaning towards the former as rubbing down I don't think has changed it much. The saw ran fine before and I'd like to reuse if possible as it's all original, and it won't get much use at all as I've other saws. Any thoughts welcome!