I've just got a quick question. My dads been a mechanic for 35 years or so, and since i'm a starting millwright and he's started to pass down some of his tools since he's getting ready to retire he's given me a few snap on ratchets and was wondering will snap on replace an entire ratchet when they become 35 years worn? Or do they take trades on new ones, or is a repair kit all that's available.