Fine Radius Adjustments on a Fender LSR Nut

The action on the low-E string of my LSR nut was a little high.  I think it's because the nut's supposed 9.5" radius doesn't match the fretboard's supposed 10" radius at the nut, or my alleged fret leveling job, which might very well have changed the effective radius of the neck.  Either way, the low string was way high.  I decided to explore a theory.  No pictures because my crappy old camera won't focus on anything so small.

No warranty, expressed or implied.  Proceed at your own risk.  Good luck.

Here's what I did to lower the action on a string.  Seems to have worked for me, except that this operation seems to have wrecked some of the springy retention ability of the retainer prongs.  I will have to be careful when changing strings forever more.  I think if I had removed the nut completely and taken the retainer finger assembly off in one piece, that might not have happened, but imagine what a pain in the ass that would have been!

1. Place the guitar on a nice smooth surface covered neatly in cloth.  The little ball bearings, once lost, will never be found again if they bounce on something hard.
2. Loosen the string and pull it aside into a neighboring string slot.
3. Pry the retainer prongs back toward the headstock a little.
4. Use a slightly-magnetic awl tip to draw out the two ball bearings.  Grab them between your pinched fingers before you lift them very high, and put them in a container.
5. Use a drill bit slightly smaller than the ball bearing cups to deepen the holes that hold the bearings.  Measure forty five times and cut twenty times.  Go a little at a time.  You can't go back.  How do you know where to put the holes?  I dunno.  I just leaned the bit into the corners ever so slightly and drilled.
6. Replace the bearings, replace the string, and tune to pitch.  If you are convinced you need to go deeper, do so.
7. Lather, rinse, repeat.

Here's what I did to widen the string slots on the LSR nut.  I'm using a set of very heavy strings (12's) and I've been worried that the low string was hitting the edges of the little exit slot.

1. Steps 1-4 above
2. Use the awl to pop out the little foam dampener on the headstock side of the nut, and place it with the ball bearings.
3. Sand away with a tiny rectangular file.  Don't wreck the retainer prongs.

Your mileage may vary, especially considering that I'm just making all of this up.