How about a little lumber porn this morning?
Look at how the light shifts and the flames roll right at the beginning... Love that.
I remedied the head stock thickness issue

I flattened that hump down, but still had a bit of a tilt to the washer for the 6th peg.

So I relieved some wood from the nut side. Just traced the washer and went around it with my 2nd tiniest chisel (2mm dog leg chisel(the one I used to clean up the nut slot)) and now the washer sets in a bit leaving it 95% perfectly flat.
There is I tiny gap under it, but I think paint will fill that in and it'll disappear.
I also invented a sanding jig

Just a slit cut half way through a bit of scrap from the coasters I made, and a couple screws. I've got 2 strips back to back. 1000 grit on one face, 2000 on the opposite.