The slots are sawed on either side of the heel block. These slots, separates the heel block in two parts, the heel and head block (which will live inside the guitar). The slots are cut twice with a backsaw to widen the gap to 0.08", which will receive the sides later.
The slot cut is 1/16" offset from the 12th fret. The web (the centre gap which is not cut) distance is 10mm.
The head block is reduced to dimension: 40mm with a backsaw.
After some sanding with #110.
