And its been sitting in the bottom of my junk drawer since last summer ...
Anyway this is hardly a new idea, but most of the time when people make these out of VCR heads they end up with a bunch of junk glued, taped, screwed, and wired to the outside of the head, making for a functional but unattractive device. I wanted mine to be as nice looking as possible (considering my limited tools and workspace) and for me that meant one thing, all the junk needs to be in the tiny space inside the VCR head
Okay then why do you want one? what does it do? Well it functions just like the wheel on your mouse, except its larger and has momentum which is good for scrolling through long web pages or piles of source code, or heck a large document.
Its also good if you do any media editing as you can scroll around in large video or audio files effortlessly, with the heaviness of the VCR head you can just set it in motion and its inertia will keep it spinning for quite a while, when you come up on something you want to work or read you just stop it with your finger.
Is it for everybody? No not really, but if you constantly wheeling the mouse in some application (and forgot the Home, End, Page Up and Page Down, and cursor keys exist) you might like it