John Shea stripping ligaments from a caribou metatarsal in preparation for making a hide scraper. Source: SFU.ca
I haven’t really mined the SFU Archaeology museum website yet – they seem to have had a bit of a makeover recently, though many of their online resources are achieving “vintage” status. One such is the photo-essay on making a hide scraper from a caribou metatarsal, or the long, straight bone between the caribou ankle and its hoof – the long bone of the foot (ungulates walk on their tip toes).
The essay is a series of over 20 pictures showing step-by-step the process of making the scraper:
Northwest Coast Archaeology 