I needed only the output spline gear, but noted the other gears are not the same (brass) metal. When I tried to replace all the gears with the new ones, I found they were so tight I was not able to seat the germs completely in place. Even replacing only the output gear was still very tight.
The servo does work fine with only the new final gear, without apparent binding. I am pretty sure there will be nothing loose!
I am only giving 3 stars because I am wondering if there is a problem with specs.
KST is always improving their gears, one of the things that make them great is a dedication to improvement. Originally KST would not sell me these gears as they said it was too difficult for a customer to install them. I imagine they have some tricks to install these with the result being super tight fitting gears. But the X08 has been around along time now and the machining on the cases may have been altered slightly.. Thanks for the feedback!