So, I came up with this simple fix. Take a cap, like from a soda bottle. Drill a hole the size of the inside diameter of the webcam lens holder. Use CA glue (Crazy Glue or SuperGlue or the like) to glue the cap to the lens holder.
Now you have a larger, more easily adjusted knob to turn to focus your webcam.

































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But... I'd recommend 5-minute epoxy instead (e.g. araldite rapid)
Crazy glue (cyanoacrylate) and optics don't mix well, be very careful that you don't get the nasty white "fog" from the adhesive onto the plastic lens, or you'll write off the camera :)