your link does not work
there is an american air gun building forum that has info on them someone built a replica
if its the one they took to america and gave to Indians and used it to fascinate them an gain access across america it had the part of the valve that seats was made of horn and the reservoir was leather and i think copper ? there was a video on you tube about them as well
this is not the forum i was talking about but thought it may be of some interest http://www.mlagb.com/cgi-bin/forum/Y...m=1306803736/1