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page 88 in here
https://www.engineprofessional.com/EPQ4-2020/mobile/index.html#p=98
look in here
https://www.enginelabs.com/news/tips-and-tricks-for-filing-piston-rings-with-real-street-performance/
and here
https://www.hotrod.com/articles/a-basic-primer-on-fitting-piston-rings/
here too...