[George Wright]

I had this tool made up about 25 years ago. It is for a 4.060 bore. On one side there is a dish cut in it that allows you to hold a ring inside of it. The ridge is about .025 tall so that the ring is exposed. I can then use this fixture to sand down the ring on a piece of fine paper taped to a piece of glass. The other side of this ring fixture is used for squaring rings in bores when checking / setting the ring end gaps.