Aside from being a bit tense thinking this guy will eventually cut himself with the knife, I think he has a good idea on how to make inexpensive, semi permanent, professional looking lens gears on the cheap. Just don't cut yourself making them :)
That looks like a heck of allot of work...my laziness prompted me to order 2 replacements from China instead. Thanks for sharing though, very interesting.
To me it really doesn't look THAT difficult, I just think he makes it look difficult. I think his use of a plate for cutting is kind of funny yet dangerous :)
this reall looks raather easy but I want to know why you would cut plastic iver a ceramic plate, and does he OWN a screwdriver? lol... but an interesting idea