Hoover on off switch won't

Question

hoover on off switch won't turn off. I have to unplug the vacuum to stop it. I have dismantled the handle and now I can't get the inditation in the handle to fit over the little silver k**b. I saw there was an on/off switch under the handle that is controlled by a piece of the handle. #1 question for the manufacturer is why don't they put the switch on the outside instead of having gimicks that turn it on and off... arghhhhhhhh