Of course you do NOT want to repair it until AFTER you convince the wife that you need a new one and have the new one safely in hand. ]
So let me recap.
By buying a new miter bar to replace the one which had the broken screw holding the washer, I now have to repair the broken miter bar, which will require me to buy a tap and die set ('cause I don't have one).
But, before I do that, I need to buy a belt sander (which I don't have) so I can grind down the larger screw that I will use to fix the old miter bar after I have tapped it for the larger screw.
On the plus side, by buying the belt sander, I will have a place to park the old miter bar, but it will be more convenient if I first remove the screw and washer that I reattached when I fixed it. Also, I will need to buy another miter gauge head.
That's looking like one expensive miter bar! And that's not including the cost of the divorce lawyer, the psychiatrist and the semi-private room at the funny farm.
Al