Harry My keyboard buttons are soft although sometimes I do get the odd button that feels sticky. I suspect it might be dust that causes a bind between the button itself and the keyboard casing and not the button swith itself. In the past I have taken silicon oil on an ear bud and slightly smear some around the button. DISCLAIMER Do this at your own risk. If you do it wrong you will destroy you keyboard.

Harry Your maximum heat is directed by the thermocouple. I believe his unit comes with a thermocouple with a maximum range of 400 degrees Celsius. The second limiting factor would be by the C100 itself. I am not sure what it is but I know it is definitely much more than 1000 deg C.

Harry Your question is not really well understood. If the blower is placed in the stand it will switch the heat off but continue to blow until the heat is at zero, at which time the blower will also switch off. At the moment when you remove the blower from the stand the fan as well as the heat will switch on and the blower can be used. If you're saying that the blower and fan goes off while the blower is off the stand there might be a possibility that that init is defective. I am not sure but I believe the unit might have a self protection circuit (over temperature) that would activate when there is not sufficient airflow from the blower through the head cause by and obstruction. See if theree are maybe not some loose stuff inside the blower that causes obstruction.

Harry quarter watt = 250 milliwatt

Harry There are spare elements available.

Harry This light will damage plants as it is NOT white day light but only Ultraviolet light.

Harry The 900M-T Series Solder Iron Tips will fit.

Harry yes it is