DIY Follow Focus Gears?

bmxbud4130

Active member
Anybody know of a good place to buy gears for a DIY follow focus?
Those of you who have built a follow focus before, where did you find your gears?

I checked local hobby shops thinking they might have some kind of plastic gears, but they didn't have much of a selection. I'm hoping that someone on here will know of an online retailer or give me an idea for somewhere else to check locally.
 
Since it is more likely that people will need to order gears online, is there a convenient way to determine the tooth pitch in order to properly specify matching gears?
 
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