So I bought 2 of these extender brackets and they arrived today. One for either side of the arm. Easy enough putting them together but I can't figure out how to mount 2 to the GeoSat 90cm. I see where one fits (screwed in below the existing LNB holder) but where does the 2nd one go? The lip of the bracket holder juts out so I can't figure out where to mount the other one.