Once you know what part you need you can then go ahead and buy it. This need not be difficult if you have a computer and Internet connection. There are many spare parts stores online; all you need is the name and model number of the part to order it and it will usually arrive on the doorstep within a few days.
Timer induces the washing machine to perform washing in the exact specified length of time. The start switch in the machine is generally a part of the timer knob and helps in the setting of the time for the proper cycle of washing to take place. Pulling or pushing the knob makes it to activate accordingly. There are two types called the digital and mechanical types. It can be installed only with the help and advice of the professional repair person.