On Thursday, September 10, 2015 at 10:11:22 PM UTC-7, John Doe wrote:
What is it called? Part beveled rod? Part double beveled rod?

https://farm1.staticflickr.com/604/2...6d1618cf_b.jpg

It looks like an idle shaft (not a driven one), just to hold a rotating part (lubricated
cog) engaged with other gearing. The flat is just intended to keep it
from rotating (and rubbing against the plastic that holds it). A filed flat
would work fine, and a bit of hotmelt glue might be all the 'fitting' you need.
The difficulty is, the diameter has to match the original. Do you have a micrometer?