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I was trying to align the rings by the outside edge, but the glue set too quickly. I then soaked the rings in acetone and separated by tapping a one-sided paint-scraper razor blade between them. (Then clean and re-sand and re-clean...) The second attempt was good but revealed unequal vignetting. I repeated the separation process. In the third attempt I had the plates installed on the camera and lens before adding the glue, and then assembled them "live", with the viewfinder on to see the vignetting.