Hi Denny,

Thanks for the kind words. There is a small metal cross section in-between the two round bars that make up the diagonal brace. I cut two tapered aluminum pieces, drilled and taped two holes on them to mount the water cage. I hope you can see I sandwiched the two alunimum pieces between the cross section. As I mounted and screwed the cage and plates together it clamped down onto the cross section. That way if you wanted to remove the cage, the original arm will be left original