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Not necessary to smooth the filing, just make sure the piston and cylinder bore sides (I.D. and O.D.) of the rings are smooth with no burrs.
That filing job is a thing of beauty, I must say. It's exactly what I had in mind when I described what was going through my head for making a gapless ring a few posts back.
Let's hope they work, eh?
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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