Bed, Bath & Beyond DSLR Focus Assist
Knoptop chimes in on Quick FX today with one of my favorite types of DIY goodness: actual retail products repurposed for production use. This time it's a jar opener that's made to be zipped shut over any sized lid. It's also very good at zipping shut around the focus gears of a lens. This provides a nifty handle for the operator to easily grab to manipulate focus. No modding required. At $2.50 you can't beat it.