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i like your variation of the frame detail what are you building yours from ?
Beautiful looking frames! I’m looking forward to see the progress on this engine.
The higher numbered cutter takes a skinnier cut, so you should be able to use a lower numbered cutter over it as long as you can line up the centers acurately. The cutters should be stamped or etched with the number on the side.The nbr 8 is the one on the right.
You may need to reset the depth of cut, I have noticed on my cutters that their diameter can vary slightly, probably depends on the brand.