Bush the peg holes.

When the violin head is spliced onto its new neck, the joint will extend up inside the peg box as far as the G-string peg hole. To provides a solid, continuous surface to work with when splicing in the new neck, the first two peg holes are filled with a wooden bushing. If the peg holes are large and worn this is a good time to bush all four holes so that a new set of pegs can be fitted.  In this case the pegs were in good shape and had fairly narrow shanks, so it was decided to do the least work necessary and only bush the E and G.