I just purchased a Macomber B5 - 40" wide 8 Shaft, 16 treadle loom with a regular and sectional back beams. I purchased it from the grandson of the original owner. Over the next few months, I will also be given many other weaving accessories that went with the loom. It has sat, unused for many years so I have to clean it up and get some replacements parts for it.
Are you aware of the Macomber Looms and Me site?
Sarah Haskell has put together a terrific blog and covers most of what you might find useful (in addition to Weavolution). I hope you enjoy your Macomber loom. I have 4 and wouldn't weave on anything else. http://macomberloomsandme.blogspot.com/