CEN is a good company and stand behind their products 100%. If you do as they ask you will have a new part in your hand in nothing flat.

As far as the stock servo goes if it is the Skyions servos I believe those are 144oz at .16 secs @ 6volts.

They are decent servos to bash with. Not quick enough for racing but very decent for a stock RTR servo when compared to most manufacturers servos supplied with their RTR kits.