Originally Posted by Kendoji
Also, it's such a lovely looking little amp, I could never bring myself to attach tape / velcro to it (though I did affix the little rubber feet that came with it).
I have a bunch of plumbing O-rings from the hardware store, and put three on each of my portable amps. They serve both as feet and as bumpers between amp and whatever's strapped to 'em. (Why three? Well, some of my amps are longer or shorter than the iPod; one each at the ends and one in the middle means I don't have to keep fussing with placing them when they slide up and down.)
Originally Posted by seekadds
How is the knob assembled to the shaft? If it can be easily removed, maybe adding a rubber o-ring or gasket between the shaft and bushing can add a little drag/resistance.
The knob attaches with a threaded lockscrew.
Quick, easy, and bad solution: Loosen the knob, jam it directly up against the shaft mount, and tighten again. You'll get a good solid SCRAAAPE every time you try to turn the knob.
Good solution: Loosen the knob, slide it off, add a nylon washer, and then reattach the knob. Get a washer whose inner diameter most closely matches the shaft's diameter; don't bother matching the outer diameter of the knob, and get the thinnest washer you can find. (It's hard to find nylon washers under 2mm thick, and that affects the overall length of the amp, which is relevant if space is tight in your amp-carrying-thing of choice.)