The Bosch rings I received do not fit flush with the top of the Bosch adapter plate. I measured one and it was 1/32" (about 0.03") on one side and slightly smaller on the other side. The wood can sink in at the beginning of the section, especially when milling small parts, and get caught when leaving the ring zone. The resulting route shows a noticeable drop of 1/32 inch. If you have a table insert/adapter for a Bosch router, I think these insert rings are the ones to stick with. I'm thinking about lining with mylar tape or making my own rings.
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