You
DO know it was a copy, based on the patents of the Webley & Scott Auto, right ?
The W&S had an exposed hammer, while the H&R is striker-fired.
There are illustrated take-down, disassembly, & reassembly instructions in this link, just click & scroll Waaay down:
http://www.bevfitchett.com/firearms-.../info-nzz.html
.