Step 6: Widen base
I used a 1.5" diameter PVC pipe fitting to widen the aluminum "cup". Place the PVC pipe in the cup and by angeling the cup while pulling, the cup is "rolled" off the pipe. This is done repeatedly rotating the cup a few degrees each time to gradually increase the diameter of the cup.
Be careful not to "flare" the edge of the cup. You do not want to create a "lip" on the edge. The goal is to increase the whole diameter of the cup to slide tightly over the outside of the Jet Deck.