Lisle 91000 drill bit sharpener

Had one follow me home from an auction yesterday. Have never used one, I have a Drill Doctor that I think is a pile of junk. Anyone have a manual for this Lisle? or ever use one, that can fill me in on it? Had one guy who used to teach metal shop in a HS career center that was at teh sale and watched me load it into my Dakota, and he says it's a little bit of a pain, takes a while to use but does OK but didnt enlighten me as to why he was saying what he did. Can anyone here?