At first glance this flute seems to be in decent condition,but as I started disassembling the instrument, the problems became obvious. Here you can see some of the dirt on the flute as I began to remove keys.
This flute is in desperate need of a chem flush. I removed all of the key assemblies, pads and corks. Then it was necessary to remove the knock pins to allow the individual keys to be separated. It is important to soak the remaining steel rods separate from the other keys. This helps to limit the amount of copper exchange that can discolor the silver plating.
Here is a before and after of the chem flushing process.
After the keys went into silver dip I polished them with a silver polish in order to seal the pores in the silver plating. This helps to slow the tarnishing process.
This picture shows a creative solution to a problem that I was having with the screws that hold the pads into the key cups. When the screw was properly seated into the spud the pad would bunch and make a proper seal difficult to achieve. The solution was to increase the thickness of the washer using these smaller plastic washers that are commonly used for removing end play on instruments that have a pilot pivot screw system. The increased thickness allowed the screw to seat without having to be inserted as far which helped the pads to maintain their shape.
When inserting one of the screws I noticed that the spud was beginning to strip. I decided that it would be best to replace the damaged spud. The first step was to remove the old spud by grinding with a dremel tool. The second picture shows the key cup after the spud had been removed.
The new spud was then soldered onto the pad cup using a lead free solder for additional strength. The last photograph shows the completed key with the pad installed and sitting level.
One of the last steps was to remove the dents from the head joint and to then install a new head cork. I also enlarged the tenons to provide a correct fit when assembled.
Here you can see all of the keys installed and clamped. The flute is ready for the pad oven. Fifteen minutes in the oven and then two hours of rest will ensure that the pads seal properly.
Here is the finished flute, play tested and ready for the customer.
One of the last steps was to remove the dents from the head joint and to then install a new head cork. I also enlarged the tenons to provide a correct fit when assembled. 
