I had forgotten that I had a 52mm lens reversing ring that I purchased before the Nikon BR-2A. I haven’t used it much, but I’ve found a new home for it. Along with the 46-52mm step-up ring I purchased for my Nikon P5100 Kit, way, way back, it will now become part of my Lensbaby kit.
With this setup, You can reverse mount the new generation of Lensbaby optics (such as the Sweet 35 and Twist 60 that I own)