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Only the top ring on KB107 need a little extra gab, is not possible to file a non file fit ring to correct tolerance ?
At Summit file fit rings are nearly three times more expencive than non file fit.






Really... A ring grinder doesn't care if you have file to fit rings or standard gap rings as it will grind them all.


I agree. Have built many of them and used ring grinder (much easier and more accurate than a file) an it could care less what kind of ring it grinds and will give you a correct ring gap. Always make sure to smooth the edges of the trim no matter what ring you use. I have seen many times where a regular fit ring needs to touched up a bit to get the correct gap.