Anybody know where to get new rubber parts for this unit? My rubber at the on/off switch gave out so the "button" fell off & now not weather proof. This is a common problem & I've not seen a reasonable fix yet. One guy used a pencil eraser-not a logical repair on a pricey unit. I posted on www.zumoforums.com & no real ideas there either. So far I don't have an idea other than $150 unnecessary send-in to Garmin or a rough repair with silicone , liquid rubber. After 30 mins on hold I gave up on Garmin tech line waiting. IDEAS??? Thanks!