I lost a throttle servo back in September. It locked up tight, so the spring would not have helped me at all. I am guessing the motor burnt up and froze. It was a pretty old servo. The worst part was that it stuck in a position that was too fast to land, too slow to fly.... It bunny hopped all the way down the runway to the beanfield, no damage to my 1/4 Scale Wilga other than bent axle.

I disconnect all of my springs, I leave the spring there, just unhook it.