Patience pays (here).
When only coffee drops mixed with steam are coming out of
the COFFEE CLAMP WITH HANDLE, it is necessary to keep
the heat source very active. Insert the conical plug and fasten
it by means of a rotary movement in either direction and wait
for about 20 seconds. The heater is then ready for use. It is
advisable not to insert the conical plug before the coffee
has dropped entirely into the cup, because the
coffee might come out around the COFFEE CLAMP.