I was asking what switch the author was talking about, he's answered that, as you know. But a switch isn't going to do anything unless you connect it to something, which you haven't covered.
Go To Your local auto parts store and pick up a switch there. Drill You A Hole in your mower in a convent spot that is in a open spot measure your hole size across your switch,and drill your hole, then wire it up. Thant all there is to do..
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You don't mean "cut" with regard to grass, but with engines people usually fit "kill switches" to make them cut out.
What do you want to do?
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For information in general: http://www.instructables.com/id/How-to-make-a-racing-lawn-mower/