We had to enlarge the holes in the peghead to take the machine heads. This is properly done with a tapered reamer. I bought a StewMac reamer for the pegs that hold the strings to the bridge and started enlarging the holes with that, but it wasn’t big enough to finish the job.

The reason for using a reamer is that it is less likely to split the wood than a drill. Eventually I realised that a tapered hole drill would do the job, so we set to work.

Once the outside of the hole was the right size it was simple to use a normal drill to enlarge the hole to the right depth without splitting anything.