I received my order of washers from Model Motorcars, who now owns Scale Hardware (see previous notes). I liked working with the people there through email. I order 0.6, 0.8 and 1.0 mm ID washers out of curiosity, not knowing exactly what I was ordering, and I am glad I did. OK, the 0.6 mm washers are small and I do not have a use for them yet. From the picture below, indeed the 0.8 mm are perfect for the eyebolts/ ringbolts. On the left is the brass washer supplied from the model kit. I think the inside diameter is too large and the 1.0 mm washer from Scale Hardware looks much better.
I did drive to our local ACE hardware and found out that after being in town forever, they are closing. They said it was due to the landowner, whatever that meant. I think you jinxed them!!