Very good info here.
I am not a metal expert but I have learned that when drilling hard metals like SS the best results are obtained when you run your drill at low speed, apply very little pressure and use cutting oil for lubrication and to keep temp low. This method will save your drill bits. Also at lower speed the bouncing will be reduced.
Waiting for TJG report.
vaccum
This are a few pics I took while servicing an ETA 6497-1
Movement in pieces
Dial side balance spring jewel
Spring off
Jewel assy out
Spring ans jewel assy side by side
Removed jewel cap..notice how tiny is the jewel compared to the pallet stones
I checked to see if it was oiled .....yes it was
Then all parts went to the ultrasonic for cleaning and rinse
Some reassemble pics
Oiling
Silicone grease applied to the seals
Movement ready to be tested for rate and beat
Now fully reassembled and lume shot
Thanks for looking, vaccum