Okay, I know I asked a stupid question of you guys, I wanted to know where the retaining collar items shown are located. I even went as far as to take my own machines apart.
Down to brass tacks.
The collar is located as seen in the image I provided from this site (as a matter of fact) on the end of the servo motor for some older model servos. It is simple to apply as far as I know, the collar slides off with the use of hemostats or small tipped tweezers. As you can also see, this item is minute in size, very, very small. the head of a pencil is about the size.
From what I can find, you simply break the small drop of CA used to adhere the collar to the shaft of the servo motor, then slide it off and replace the motor or whatever application that you are doing. Then simple as it is, slide a new one on, and add a very small drop of CA to hold the collar in place, being sure not to glue the motor shaft to the housing of the receiver.
I also hear it is usually suggested to apply a secondary one behind the first if need be, and also glue that one in place.
I hope this helped a lot. I know finding my own answers usually helps me out.