I ended up planing another 2 pieces of wood with a concave curve so I can route the truss rod channel under the fret board rather than through the back of the neck. There is a 1/4" drop from the end of the neck to the centre and back again. I mounted the two pieces parallel to each other on a board and then realised my router bit was not going to reach so I added a block of wood for the neck to sit on.
I then used dowels to keep the neck in position with a little card to make everything snug. This proves to be a problem as after the 3rd pass the card started to move meaning the neck moved a little. This is why i wanted to route under the fret board to hide any mistakes... although I should have really practiced with a piece of scrap first.
I drilled a hole at the nut end to accommodate the anchor and stopped a couple of inches short of the body end and drilled a hole for the adjustment nut. I then made a slot at the body end to allow me to install a washer to spread the pressure from the adjustment nut.
I fashioned a hardwood fillet to cover the truss rod slot and clamped it up to dry been careful to avoid getting any glue on the truss rod itself. I will plane this level once the glue has dried before fitting the finger board.
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