Good luck trying to find a 1/16th slot cutter. I looked everywhere and came up blank. I even went to a woodshow specifically to talk to Mark from Oak Park Enterprises. He sells the products from The Router Workshop on TVO. I figured if anyone would carry it, they would. They're router GODS. Nope.... not much call for it. I tried Lee Valley, no love there either.
I finally went with the 1/8" and filled the gap with hot glue. It worked like a charm, it holds like iron. I think you'll have to try US mail order if you're set on getting one.