Just a note for the Home Depot crowd - if you get an ABS 2" sewer line tee and sand out the inside just a hair, it will fit nicely over the ski pylon. Now, if you glue a short radius elbow at just the right angle to one side, it will point slightly up towards the windshield. Glue about 2' of 2" ABS straight pipe into this. Next, get a 10' of white/grey PVC 2" built-in vac tube and a tee of the same stuff. The 2" vac-tube is a perfect sliding fit inside the 2" ABS and the tee on the end can be notched out to fit over the windshield. Total cost - $12. Since you've now got a sliding fit between the ABS and the PVC, the support becomes sort of springy and is both easy to install, easy to get the snap top over and easy to fit - just need to get the length to within about 12" and Bob's your uncle. I usually put a sock under the top to protect the windshield (like the plastic might scratch the aluminum...) but that's not entirely necessary.