I thought it's kind of obvious. But anyway, it's between the middle two mains (vertical), up against the last (nearest to the handle) cross (horizontal). But some dampeners are wider, and all sorts of weird shape, then use your best judgement for those. And sometimes people like to put it against the frame, instead of the last cross (horizontal), which feels weird to me. And if you can find any other spot that does a better job of dampening the shock you don't want, like on the top, be my guest.