I have read quite a few times that Savox servos are pretty tight fitting, quite often needing to be pressed on.

On my 1268SG, I found my servo horn was also a very tight fit.

Speaking of my 1268SG, it's on it's way back to Savox (I assume they already have it by now), I had a BEC failure (CC 10A) and possibly took the servo with it.
When I initially tested it, it seemed to be working, I got a reply from Savox saying it's fine to run on 8.4v, which I did (to confirm it was working correctly) it stopped after a few seconds.
I was just asked to send it in and if they find a problem with it, they will send me a new one.
Coming from Australia, I thought that was pretty decent, I just hope they do as I've been told.