I'm pretty sure mine [purchased new] never came with any instructions.
Maybe something I can answer for you?
The camber marks are pretty accurate, zero gives a nice, even cut.
Every other brand arbor I've tried fits and runs true [Integy, Hudy, etc].
Replacement bits are as easy as buying a hacksaw blade and some tin snips if you don't buy a carbide bit.
Pretty basic unit really. So, again, if you have a specific question, I can try to answer it for you, but as far as I'm aware, there's no paperwork out there for it.
Privateer racing lots of stuff.
Remember kids, racing isn't fair!