The Weller welding station available in AIRlab has to be left off once finished the work. There are soldering points of different sizes on the back of the soldering iron handler: use the one most appropriate for your work. In particular, the thinner one has not to be pressed in order to avoid to damage it. Points should be changed when the soldering iron is cold, by unscrewing the handle part. Points should always stay at there place. A replacement is available asking to Giulio Fontana or your tutor.
When points are exhaused, tell this to the same people. They will buy new ones, for instance from here.