Massive Cup Holder

Just picked up a 2013 Oasis and even though it has two cup holders person, neither is ideal for my Timmy's paper cup. I don't suppose Hobie has an insert available for the large cup holder do they? If not, I'll have to make something out of foam.

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Cheers,
Adam
http://www.yakfisher.net

I cut a rubber pipe cap to do the same to my wife's Toyota Rav 4. I think I used a 3+ or 4" cap, cut the end off, and even cut the "ring" in half and removed small sections until it fit just right inside the cupholder. Maybe try this out in the yak?