Hi Wayne,
I have used a leather strop to sharpen my knives and chisels for almost 30 years. Leather is a fine medium but I use methods for polishing metal described in Espingarda Perfeyta, the gunsmith manual written in 1718 by Portugese smiths. They used sticks lubricated in water or oil and dipped in some abrasive powder. They also used stiff brushes dipped in abrasive paste made from water, abrasive powder (rottenstone) and soap. It works very well once the file marks are gone. I can shape the sticks any way that I need. I visited the NY Metropolitan Museum of Art recently and looked at the gun collection. I was amazed at how well the wheellocks were polished while preserving the crisp lines and edges. It really put me to shame.
dave