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I would suggest that you take the opportunity to make a double crosshair. Put the retaining ring/ferrule onto a piece of timber and then 4 drawing pins into a cross shape surrounding the ring. A fine gauge copper wire that you can strip from an old electronic choke can be wrapped around the drawing pins and over the ring to form a double cross hair with a square in the middle. Four dabs of epoxy, allow to set over night then trim with a sharp Stanley knife. Beats the heck out of using hydrofluoric acid on glass.
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