I learned the hard way, when I was trying to shave some weight in my 1/12 scale. I ended up with a couple of micro servos that work great, but have these skinny little output shafts that only fit the horns that came with the servo.

There was a post just a little while ago in the 1/12 scale thread that showed the Savox 1250 with a servo saver on it, so it seems your recommendation was good!