Hey Simon,

Thanks for your note. I found the string tree in the pack of screws after I thought I'd finished and wondered what it was for After I figured it out, I installed it and it worked perfectly. No need to file the nut slots for the upper two strings.

I only now have one remaining issue, which is that the A string buzzes slightly when it's played loudly. The E was always solid, and the tree string fixed the D and G. I've tried to string the A as low on the tuner as possible to maximise the downward angle from the nut to the tuner, but I can't get it low enough.

Is there anything I can do to help the A? For example, is there a tree string for the A?