We have also found that the 94145 are very fragile. We have taken new servos out of the package and have them not center properly. So far I have sent in 3 new ones to Airtronics in the past year for repair. We have one of the JR3550 servos. It was a used one with a car. Not sure how old this servo is. It has worked without any problems all of this season. The new CRC CK has the holes in the chassis predrilled to mount the 3550 servo in the AE solid mounts. The JR3650 is the digital version of the 3550 and has the exact same dimensions. The price is just a few dollars more.