Haven't crashed the Trex 500 yet, so I have not started collecting part for it yet
(Hopefully I did not jinx myself!)
Did you lose a ball in the thrust bearing, or one of the main bearings on which the main shaft rotates on ? Need a bit more detail to respond further.
If you can post pictures, that would make it easy. A video would be ideal, that would tell us what kind of vibration you are seeing.