There is a small hex head screw at the end of the cutting tool and a hex key is included. This screw is removed to replace the bearings. The different bearings change the depth of the tongue. Unfortunately, this screw was screwed in so tightly that the hexagonal head broke off immediately. As soon as it slipped the first time I threw away the unnecessary Allen wrench that came with it and used one of my good ones, hoping I could buy enough to loosen it, but no luck. Buying a bit with multiple bearings is useless if you can't replace them.
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