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I sometimes use the brass Escutcheon Pins from a hardware store. The shank is often 1/16th inch diameter.
182723
Many hardware stores have them. I also use Brass Finishing nails and pound the head...

The modern type are available on line. The bay often has them as do some of the Dovo suppliers. Just a fancy headed nail and a shaped washer for the other side.
Watch a Dovo manufacturing U-Tube.at...