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Some comparison to brass #0's pics here.
http://straightrazorpalace.com/workshop/69508-found-small-stainless-washers-new-peening-mathod.html#post785939

Roy, there are these from Fastener Express #0 Flat Washer NAS620 CO 18-8 Stainless

or these from Microfasteners FWSSO .062 x .125 x .017

The ones from Microfasteners are a a tad 'sturdier'...

They also had an unlimited supply of bone,horn & plastic. I still find it odd that ivory razors were peened washerless when the others werent so often.
Just to go a little OT, I had a Winchester...

It ain't over till it's over. :)

Great tute Tom. How much leeway do you allow when slotting the holes ? Did you pin sans washers finally ?.