I've found a used Chicago cp9160 on Amazon listed at 61.55USD. It's one of the models I've been looking at and seems useful for bulk removal of matrix. But! I can't figure out if I can set in new needle or if there are different ones like chisle shaped! Where would I get accessories (couldn't find one on what I think is Chicago's website) and what price do new needles usually run at?
Also wondering if this is a good buy? (it's the red one if you filter for used air scribe on Amazon). Would you recommend it to a newbie with no experience? (I have plenty of air compressors so that won't be a problem).