The support poles on either side of my bimini are actually a pole inside a pole. The push pin operates similar to that of a kayak paddle. The pin is attached to the inner pole and you push it in and pull or push until the pin pops out in another hole to adjust the length. On my bimini support poles, there is only one hole about 16 inches up from where the bimini attaches to the tower facing the rear of the boat. I have an 06 lsv with factory speakers. Is it possible that this is a new feature or that they only include on boats with factory speakers? Maybe your dealer or skier's choice could tell you more. It may be possible to buy the newer bimini ($500 I think), but that would suck as I'm sure they wouldn't accept the old one as trade in. Who knows if the attachments are even the same because I think they have changed the towers since then as well.