truthfully, you didn't need to buy anything.
for knapping, most anything will do, even just a large bolt/screw. in fact, you don't need any thing - pull the cock to full, close the frizzen, release the trigger whilst holding the cock and allow it to scrape the frizzen (this is most likely how it was done, circa 18th century).
any piece of wire will do well for picking the vent (i use a piece of guitar string), a cut off small paint trim brush or toothbrush for cleaning (i prefer a ripped off piece of flannel shirt cloth).
that's it.