Ok, I never made it to Home Depot. My wife and I were able to shop kid free and ended up at bed, bath and beyond for what felt like the rest of whatever youth I have left. Between that and my LOD hunt my day is shot.
I thought of velcro but to be honest I don't want adhesives on my iPhone. This might sound silly but it's too pretty for that. The amp looks beautiful as well. That's the same problem with the dual-sided tape that they (or him?) include with the amp. I will be using my phone much more often without the amp than with it.
Maybe I will look for small case I can keep the amp in that I can somehow slide the phone in when needed sorta like some kind of portable hard drive/iphone case monster.
I am holding out hope for the o-ring idea though. It seems so much cleaner. I love the look of the old iPods banded to the amp with the fat bands that some amp maker sells but I like touch screens better.