I'm in the process of revising my webpage on treadle hammers other than the Grasshopper. If you haven't viewed this recently, please do:
I would be interested in knowing of other treadle hammers than the ones listed. I will add to the page (1) completely different designs or (2) designs which are manufactured for sale or (3) designs which are available as plans. Photos or drawings essential. Contact me off-line if you have any such info, or know where I can find it.
In particular, I ran across a photo SOMEWHERE that I cannot now find. IIRC, it was of a fellow standing in front of a yellow treadle hammer. If that rings a bell, and you know where I can find the photo, please let me know, off-line.