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My most recent advice from one of the Australian coating outfits, is to rest the mirror (surface down) on 3 equally spaced triangular wooden wedges glued/screwed in position on a board. If positioned appropriately, the mirror edge can be made to rest on the slope of each wedge. When this is done, a further 3 wedges can be pushed in against the mirror and glued down. Only the rear of the mirror actually gets anything flush against it. Any comments?
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