New E-Maxx chassis

[IndyEMaxx]

I have a question regarding the new rear center driveshaft dogbone and cups that came with the new chassis. Should the dogbone actually move back and forth in the slots of the cups? Or should it be pretty snug in the slots? Mine moves quite a bit and today I had to replace both "pins" that hold the cups to the Diff and Tranny. As far as the "pins" go, I had to buy the entire stock parts that included two "pins" and the cup for the ball joints that the stock shafts use. Can anyone tell me where to get just the "pins" and is it a good idea to use Loc-tite on these "pins" or not? Thanks for any insights anyone is able to provide.