Here's the thing. There are certain euphemisms in the blue collar world that I'm pretty sure most women have no idea about. For example: When spot welding, if too much metal drips off a joint and leads to an improper seal, it's called "a tit-banger".
I made that up. That was a test. I just wanted to give you girls a sample of the kind of reckless misogyny you are in for. Man. Men sure are jerks, huh? (*lights incense. flips page in "What to Expect When You're Expecting*)
Okay, for real this time. When something is very close to the correct position but still off by a little, the amount of adjustment necessary is "a cunt hair". This is NOT a joke. I'm being serious. Let me us it in context so you can roll it around your tongue a little. "Jeez Dave, you almost have the timing set right. You just need to move it a cunt hair more clockwise." or "You almost crushed that prostitute's trachea! A cunt hair more and it would have gone from auto-erotic asphyxiation to "lawyer time"*.
I've also noticed a trend lately, in more PC work environments, where people refer to that distance as a "c-hair" so as not to say the possibly offensive word and get themselves fired for sexual harrassment. It's like Louis C.K. says though...if you don't say the offensive word but just abbreviate it, than you'r making ME say it in my head, and thereby making me a sex torturer or woman hater without my even meaning to. Not that saying "cunt" makes anyone either of those things, just that's how people treat you if you say it in public. (or shout it at the Homecoming Queen as her float goes by because you've had one too many banana daiquiris by 9am. Sheesh! I said I was sorry!)
*This is misogynistic because a) she was a prostitute and therefore being compensated for her strangle sex, and b) I said so.