While I am staying home, I am pulling out "projects" that I can work on...and learn from doing. This project watch is a Hampden, Dueber Grand/ model 3, 18s, 17 jewel open face from about 1899. After letting the power down I removed the balance screw and bridge. The bridge came off and left the hairspring and balance wheel behind. Closer inspection revealed that the stud on the end of the hairspring was no longer attached. Nuts! Here is where my new learning begins. Is there a right way to reattach the stud to the hairspring? Do hairsprings come with the stud attached...should I be looking for a anew hairspring? Please help with your wise counsel and experiences in this type situation.