He claimed that the model is KMC X9SL said guarantee is X9SL bought from CNC. But not all the links are hollow links (only alternate links are hollow). I gave him a kind advice to email CNC who shipped him the wrong part, end up I received some attitude in return. I gave him a benefit of doubt that he got the wrong part and not on purpose as he looks to be an honourable person, but the attitude is unacceptable. But I'm wrong that I was late for his appointment for 30mins as I was on fever, MC, which I had told him, plus I lost my way there. He reach after 15mins after I arrived which I don't mind as I know I'm in wrong first, but he accused me that I late for 45mins. What's going on with this world...?