ouch.... My Knight is a horseman as well and I am familiar with the stress. My condolences.
I am hopefully going to be getting the Howe Model B that is on ebay now.
I currently have "most of" three Howe Model A units. Once things get settled out, if i am able to do the repairs and/or re-manufacturing of a few parts, I will really only want one or two.
and SURE, go ahead and PM my your hard to find list. Ya never know what i could find.