I use The Colt Single Action Revolvers - A Shop Manual Vol 1 & 2 by Jerry Kuhnhausen.
Kind of hard to find these days. It was published in 2001. I think amazon.com has it.
I found it at Midway. I'm assuming the info covered will also apply to my open top Dragoon. I will order it right away.
Vol 1 and Vol 2 for only $34.95 + shipping.