The desoldering pump may be too light to use. It is enough to twist slightly and the upper part will pop out of the lower one. Fixing after pressing the butt did not always work or the button jammed. When the demolition pump was running, it was functioning normally. But the solder wick was oxidized and not coated with flux so it didn't absorb the solder so the solder wick got 1 start and the desoldering pump was fine or 3 starts but as they came and were bought together as one item the gets the Combo only 2 stars. True, I didn't pay much, but it also has to work or run in the demolition pump for more than 5 minutes before I had the problems.