I'm looking for one of the AO vertical heads for the Series 10/20 scopes, not the angled "M" monocular, but the 1040 which is vertical.
Cash preferred, but I do trade if desired. I have some extra series 10 and 20 parts (stands, condensers, stages, bino heads, trino heads, etc) and a lot of other stuff as I have other hobbies (astro, machining, etc) as well as a few 100 and 400 series parts.