Twenty five years ago I used to own an A/C business that just worked on window-shakers. I used to make all my own repairs. I went to trade-school. But I forgot a lot. I can't remember if we're suppossed to debur small diameter copper tubing for A/C work. I can't remember if deburring small diameter copper tubing was discouraged because of the possiblity of introducing copper particles into the system. My inclination is to always debur.