Sorry this is a few days late. Pics of how I mounted (click on pics to enlarge)
(1) stick the shiny round disk onto dash where you mount the GPS "holder" (stcky side down; shiny side up)

(2) Arrange the "holder" to look like this:

(3) Mount "holder" in that position onto black disk


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Accordingly, I didn't know that! I had switched mounting it between the 2 cars many times and I thought I was responsible for its loss of suction. Thanks for the tip, I'll call them if my suction goes really bad.