I go to 12-step meetings. Sometimes they hand out coins to commemorate years of abstinence. For a long time I've had the idea of making a keyring which would be bored to just hold one of these coins. I finally worked up a design which I've figured out how to make from sheet brass:
The dimensions aren't particularly significant, but the large hole diameter is 1.354" and the small hole is a #10 hole. The brass is 1/8" sheet brass.
Sorry for the fuzzy picture.
Grant Erwin Kirkland, Washington