[dearolddad]

I am conjuring up a swat like team descending on a local pizzeria and dragging the owner out in cuffs because the micrometer showed a slice one RCH out of kilter.

On this forum can you explain what you mean by an "RCH"?

[Bob]

That’s an old military term for “a tiny bit”. The first word is “red”; the last is “hair”. I’ll leave the middle one for you. :=)

[xrmusn]

On this forum can you explain what you mean by an “RCH”?
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Well, I could, but seeing as how I am a gentleman and have manners, I prefer not to.

However, observing the way you worded your question you obviously know the significance and already knew the answer.

On a related subject, “Tain’t” comes to mind.