Ok I admit I am no professional blade restorer but thru my many other hobbies and life experiences (this includes professional toy restorer ( that's right plastics) and a pro bike restorer) I know many people want that rough rustic finish I think is hot! Try a bit of epoxy on most of the outside of the crack using a needle or toothpick to work it down. Don't go to the pivot all the way as you want free swing, if you want a bit of filler sand some cheap dark wood and mix the dust into the epoxy the polish you use on the rest should blend it all. I might beway off base on how to do this on a straight but I know it's how I would have started to keep a bit of the age and character of the whole, while making it strong and sturdy. Hope this helps more than it bombs.