OSH near my house has a few of the old style ash sweeps. I'm interested to see how the part fits. The central hole was the nomial dimension from mine so the decreased tolerance should make it fit better. I'll want one for my ss project! Thanks for bringing this to life, Brian!
As far as ash sweeper #7409 running out, I'm working on a part that will allow #7444 to work with the old style ash catcher setup so don't worry. You will still need this ashbar though.