I bet there would have been no complaints about Cavewoman’s
fingernails if she would have invented one of these! I slapped a
horsetail patch onto a piece of fire-shaped Yellow Cedar (affixed
with deer hide glue) and saved my fingers some friction blisters via
the easier grip.
Some excellent sanders and smoothers for light or finishing work.
Note that the red-sand sander has been used to shape the ends of a
hand drill spindle. Deer hide glue seems to be destined for more
delicate work in the realm of primitive sandpaper. Perhaps tree
pitch is sturdier.
There are other fine paleolithic uses for Horsetail, like this Pan
Flute. But that’s a subject for another time...