My girlfriend seems to have managed to magnetize her Nomos Club - it's running minutes fast per day, and looking at the balance wheel through the see-through case-back, it looks like it's not swinging around fully, like it's kind of stuck or sticky in some way.
My first question may not really be a watchmaking question: if we send the watch in to Nomos, will this kind of defect be covered by their warranty or will they consider this "misuse" and charge for service?
My second question - what does it take to demagnetize a watch? Does the movement have to be disassembled or is it enough to run the fully assembled watch over the demagnetizer? I ask because I have a local watch repair shop, but I don't fully trust them (questionable experience with service of an old Omega modified ETA-2892 - if anybody has a recommendation for good watchmaker in the San Francisco Bay Area, please let me know!) I wouldn't feel comfortable letting them open a watch that's still under warranty.
Or can I even just buy my own demagnetizer from Esslinger/O. Frei and do it myself with a reasonable chance of success?