The SG5010 servo internal is like a Futaba servo, or GWS servo. It has a little piece of plastic that connects the pot axle to the spline gear. All you need to do is remove that piece, cut perfectly the stop on the spline gear and use ONE drop of Superglue to fix the pot in place when the motor stops spinning (using a 1.5ms signal, rotate the pot until the motor stops spinning).
MAKE SURE you don't spill glue on the ball bearing!
Here are some pictures of the gears and the piece you need to remove:
- in the first picture you see the black piece on top of the ball bearing,
- in the second picture you see it removed,
- in the third picture you see the stop allready cut: