Making the access cavity

On guitars with angled-back head and head-end adjustable truss

rod enough space has to be left to allow getting at the adjustment

nut. In the case of allen nuts the width of the channel will do, but

for hex nuts a sufficient amount has to be removed around the

truss rod nut; use a chisel and a 12mm (1/2") carving gauge to

remove just as much wood as is necessary to allow access to the

nut for an adjustment wrench (5). The washer used on this 5mm

nut and shown in the picture is 8mm in diameter, and the

wrench needs a 12mm opening (6).

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Picture 7 shows a neck ready for truss rod installation. The

bottom side of the fillet has to be shaped in accordance with the

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curve of the truss rod as shown in the illustration below.