Xbox 360 modded controller


I want to make an xbox 360 modded controller. What is the easiest way. Also  I don't want to drill a hole to add a button so can anyone teach me how to do a sleeper mod. Like a mod for my controller where i just press the sync button to change modes. Also I do not want to buy anything for my controller to help with the mod(e.g. Intensifire) Just post your thoughts or answers.