I brought one of these ( Ser No.2093) in reasonable condition, but it has lost the breech block. I'd like to make a replacement, and I can see most of the works, but the catch is puzzling me. My carbine is identical to several I've seen photos of, with serial numbers in the 1000 - 3000 range, but the catches in the photos ( steel file-cut button) differ from that shown in Warner's Patent of Feb 1864 and I cannot work out the details well enough to make a replacement. Can anyone send me a reference to a drawing or more details, or tell me how it works? Does anyone have one, and are they common? It is the model without the extra hammer that functioned as a lock.