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After the headstock face has been band sawed to just over 1/2" the 3/8" anchor drilling can be made at 3 degrees, using this jig. The 3/8" drilling goes to 3/8 or 9mm in front of the nut face where the anchor will sit as it is "heel adjust vintage", man....https://i.imgur.com/jJ5X3UQ.jpg
The steel insert is changed for the 5mm one and the drilling is continued until it joins the truss rod channel, hopefully at the right place!
Now the headstock face and transition are drum sanded now all the drillings are done.https://i.imgur.com/W410NTO.jpg
Now to make a truss rod, I have a bunch of 3/16 mild steel rods and some anchor's made from 3/8" steel rod that need 10-32NF threads cut. (The bar used to make the anchor is lying on top of the vice, enough left for a few more! Grin)
Peened over with a center punch and test fitted.
I dont bother with shrink wrap tube any more as think it sucks Tone. If the rod is partially tight under tension it is locked into the curved recess and it ain't going to rattle! As a precaution against rust and any glue ingress I heat the rod and wipe a paraffin wax candle all over the rod, this should lube it a tad as well as help with moisture.
Now I can glue in the walnut dowel to lock the anchor in place, this is 10mm dowel reduced to 9.5mm or 3/8.
I have some nice walnut 1/4" sheet and 10mm dowel from a hobby shop but fancy some "American Black Walnut" for the skunk stripe fillet. Luckily I have 1 last off cut left from a big board just long enough to bandsaw into 1/4 strips tomorrow.
I also have a fair bit of hard "rock maple" and a board of Eastern Curly Maple (Acer Rubrumn) on the bottom of the stack. This neck is a dry run then I want to build some Flame Maple necks as well. These will be "2 piece" however with rosewood finger boards and no skunk stripe.
I checked with Mike at CurlyMaple.Com to what species the Curly Maple boards were I had purchased for tops mainly. He confirmed it is eastern red maple acer rubrumn that is almost as hard as rock maple acer saccurum. Some Tone Wood vendors sell "flame maple neck blanks" that are Western Bigleaf Maple or Acer Macrophyllum that IMHO is too soft for necks, although violin makers use it by all accounts. Just my 10 cents....
I will post some more when I have the black walnut ready to glue in the skunk strip and a bit more progress made, fingers crossed.