Moin, I got an 828 "Sickentank" that I bought as a parts carrier. When taking stock, I noticed that the lamp was completely untampered and technically new. I was able to recondition the surface, the technology only needed one cleaning. Unfortunately, the tank had once received a bad hit on the pressure gauge and was badly depressed. With a self-made pulling device from a defective manometer from Chinese production, I was able to carefully pull the nozzle out again. I pulled the socket out again with a threaded rod that was inserted into the old manometer. A plastic pipe is used for support by pulling very carefully and checking frequently, I was able to quickly and completely eliminate the damage.