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put your finest file in a vise & move the ring "in" toward the tang of the file with contact in that one direction only. File one end only & keep it square & deburr it when you get the gap you want. I use .003 per inch of bore (2nd ring)

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There you go

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The KB hyperuetcics need a wide top ring gap because the ring is moved closer to the piston crown (where the heat is) and the material doesnt tranfer heat very well.

Keeping the second ring gap wide is almost always a good idea on any piston. It provides an escape path for gas pressure that can build up between the top two rings. This will help keep the top ring seated on the ring land of the piston (where it needs to be to seal well).

Take a look at some second ring gap specs on modern diesel engines.

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I would gap the 2nd ring at .004/inch of bore plus .004. I think that ends up around .022-023. On the filing.. by assembling yourself you're saving a bunch. I think my ring filer cost $30. IMO, it's not worth doing without the proper tools. Thye are that important to good power production.