Congrats on the find!
Since this thread last came around, I've acquired the Howe High arm and the Portman.
And if I'm lucky - I'll soon have the Eldridge long shuttle machine too. I bought a fiddle base Eldredge, and this one was made before National was formed. So unless it got modified, it will take the long shuttle. Just got notice that it shipped, so now I have to wait for it to get here!