i would greatly appreciate some advice. I have taken a Hamilton wristwatch apart for cleaning. It is a caliber 986A. It is completely apart except for removing the mainspring from the barrel. Here are my questions: should I remove the mainspring from the barrel, or just place it in cleaner and ultrasound the mainspring and barrel together? If it is necessary to remove the mainspring, how do I get it out of the barrel? What should it be lubed with? In the attached pictures, is the "rub" on the barrel an indicator that it does not fit correctly? In the picture of the mainspring barrel on its side, is that a crack in the barrel , or perhaps just a scratch?
Thank you in advance for all comments, suggestions, or criticisms.
Bill