I discovered an easy way to make tinder one day while trying to split some elm logs for firewood.
Elm is incredibly hard to split by axe. I used steel wedges and a sledge hammer. After several attempts, my brain started working again.
I cut the log along its length with my chainsaw to a depth of an inch or so. by doing so, I broke the grain enough to allow me to assault the log with my axe. Success!
The added bonus - Perfect tinder for starting my campfires.
I know it could be considered non-bush crafty, but who cares - it works.