Yes they are soldered on...soft solder. Yes, if you can torch solder skillfully then you could do the repair. Acceptable alternative repair methods?...IMO no. Temporary fixes that will be a PITA to undo or take time to clean away for a proper fix yes, many. Will you damage the lacquer? Probably a bit, minimally if your solder skills are good. If your skills are not good then not only could laquer be damaged, you can heat it enough to detach other parts, burn lacquer and possibly crystalize the soft solder so that fixing your mistake will be costly.A foot for screwing on one of the individual key guards on the lower end of my sax came off. I assume these are soldered on. If I have prior soldering experience, would it be reasonable to expect that I could repair this on my own? Are there any other acceptable ways of reattaching the key guard foot without soldering? Could I go about this without damaging the surrounding lacquer?