1. Get through the year without getting killed or maimed.
2. Train his own replacement.
3. Write down or otherwise record the stuff that only he knows, in excruciating detail, so that his replacement's replacement has a decent chance of picking it up.
4. Recommend which machines need to be rebuilt or replaced. A machinist who grows old with a machine learns to compensate for the way the machine ages. A machinist, even an old one, new to an old machine may never be able to achieve the performance that the old guy could deliver.
5. Document, with photos and drawings and instruction sheets, the special tools he's made over the years, and how to use them, and what to use them on. You know, the odd lumps of metal that he keeps in his best toolbox for no apparent reason?
Mike Halloran
Pembroke Pines, FL, USA