Respectfully, and I know that this is like telling you to buy a steak dimmer when you asked about pork chops....

Use feeler gauges to measure how much she is off face then add .001" to that measurement. Look in the yellow pages for a company doing Industrial HARD CHROME PLATING.

Take the barrels to them and ask them to mask off everything apart from the hook. Then tell them how many thou you need on it. They will put it in the tank ( a body heat level process) and plate on that amount (they can tell thickness by time) Then you have to just let her back in that spare thou with the use of round or half round diamond file, It must be diamond nothing else will touch the chrome not even stones.

It is completely non destructive and controllable and permanent. Done correctly it is impossible to see.

Regards.