Naturally, I wanted to modify a few of these for continual rotation. The method I came up with is super easy and requires no soldering!
Interestingly, you don't even break the "warranty void if removed" sticker. (What the...? We're not even voiding the warranty!?? Well what fun is that???)
Step 1: What U need
1) The servo to be modified, of course.
2) Some way to control your servo. (I'm using a Pololu MicroMaetro and control software.)
3) Some wire cutters.
4) A straight pin.
5) Small phillips screwdriver.
6) and probably a paper towel (cuz things are a little greasy in there)
Step 2: Take it apart
Once you get to the gears, remove the output gear. This is the only thing we'll need to change.
Step 3: Poke out the insert
The easiest way to do this is to poke it out with a pin. There are two holes in the white plastic piece that make this really easy.
Once the insert is removed, you can throw it away, but be careful not to get it confused with the black washer. We still need that!
Step 4: Snip the stop
Anyway, grab your wire cutters and do your worst. Just watch your eyeballs, because that thing can really fly!
Step 5: Center the pot
Then turn the brass pot shaft (formerly below our friend, the output gear) until the motor stops. You'll have to go really slow to find the perfect spot where the motor quits chattering.
Step 6: Put it back together
I've included a pic of the gear train in case they all fell out and you didn't see what went where. Also, note: Of the two gears in the center, the fine-toothed one goes below the other one.
If you have parts left over, don't worry. Remember: If it works without it, you never needed it! :)
The only tricky part is getting the rubber band back in. I eventually found it was easiest to start the screws, press the package lightly together, then put the band on. Press it into the gap with your fingernail. Also, tighten the screws up evenly so it doesn't squish out.