Instructables

EZ continuous rotation servo -- without solder! (CSRC-311)

Step 3: Poke out the insert

There is a black insert pressed into the output knob.  This normally turns the pot below, but we're going to take it out.

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!
 
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