you can double check with a "go - nogo" test

basically just pick the next thicker feeler and try to get it in there after you adjust it. if it fits in, bad. readjust. After you pass that test try the next thinner from the correct setting. if it wont fit your too tight, try again. then repeat the other test. Do this until you pass both tests with out any adjustments. Always adjust with the correct feeler guage and check with the next thicker or smaller feelers. DO NOT adjust with the "go-nogo" feelers it will be wrong. Its easy to not swich back to the other feeler between checking and adjusting.

I know you already solved it, but someone may find this useful.