Silver Supporting Member
When you have a string binding in the nut slot it always pings just as the string is coming into perfect tune?
If the string is being pinched in the nut slot, all it takes is the right amount of pressure to unpinch it. The fix is polishing and/or widening the nut slots or replacing the nut, the band aid is lubricating the nut slots.
I maintain my answer. It's never gonna have enough tension way below being in tune to ping and still be below tune. Instead, you get it near tune, it pings, and suddenly its above where you want it. So it seems like it was "right there". If it was tuning smoothly, it would've been in tune somewhere in that range, but probably not right at the spot where it pinged. And there are probably some that would start to bind above pitch, but, like I said, you never notice those, because you're not trying to tune it up there.
Or, I dunno, gnomes.
So I generally try to be a KISS kinda guy...
Try tuning that string a 1/2 step sharp a few times then back down and up to pitch. I bet the "new" ping spot becomes a 1/2 sharp and no longer right in tune. I imagine it is pinging because that's where it has been seated with the greatest amount of pressure. I bet it loosens up and never a problem again... unless you whammy.