I know it is hard to find info on Macomber looms online- the builders don't have a website themselves [probably don't have the time!]. I love these looms, sturdy and ready for hard work, so I was really happy to find a mention of this new-ish blog this morning.
http://macomberloomsandme.blogspot.com/
Sarah Haskell, a Macomber dealer in York Maine has begun a blog about the looms and manufacturer, and has some really good info so far, plus nice shots of new looms being built.