My husband and I do woodworking for a hobby, so my first thought was on how to use wood to replace the stylus should it break (or when it breaks

).
There are 1/8" dowels available for pennies that fit perfectly, and the bottom can be shaped easily.
I think that's the way I'll go when the time comes.
Not that I've ever yet used the stylus in my short career as Sony ereader owner.
Gudrun