My boat was driven under a power line which demasted her. When we replaced the mast I wanted to keep the internal halyards. The following pictures detail the process.
The mast head needed to be repaired.
Next we drilled guide holes for the Halyard exit plates.
The hole on the left is for the side stays of the mast raising kit.
Here is the exit hole. Pop rivet holes, and the finished product.
Measurements for the Jib halyard. We wanted the jib halyard as high as possible, but needed to miss the fore stay bolt. We then pop riveted the sheave in place.
Here's Paul's sliding gooseneck. I love it.