I bought some washers of the correct diameter. For 5 of the washers, I filled the hole with JBWeld. Using a surface below, and leveling the top made it mostly smooth. For another 5 washers, I tried using that fake weld stuff. Like solder. That was a disaster.
I'll use the original washer to drill the off-center holes, later. My plan is to paint these washers charcoal black, later. Hopefully, there will be 4 good washers out of the 5, which will give me a matched set.
No one spoke up to offer other suggestions, so it's too late to criticize.