Low speed is the word on the street, Ronno; standard buffer/grinders spin fast and, even with flannel wheels, can strip nomenclature or details from briar and scar or melt stems given a moments inattention. I use a two speed buffer that isn't ideal but it's passable. Some guys mount a variable speed drill and go that route.
Bible:
http://www.aspipes.org/faq/faq/ASP_B...ishing_FAQ.pdf