In my experience, sometimes you really have to work at it to get the feeler gauge in to take the measurement. Why? Don't know. Moonphase? Solar flares? Anyhow, I noticed a similar phenomenon. I couldn't get in the .0025, then all of a sudden it goes in, but now the .003 goes in real easy too. I found that in some situations the .0025 didn't want to go, but I would keep working it, and then could get it to go.
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