Kyosho ST upgrade to STRR and Conversion

[Gee]

I have some universial shafts coming in the mail and one last part to get installed correctly and I almost have a STRR. I need some help though with the suspension pivot block that hold the top front arms in place. I installed it the way the exploded view shows to with the oblonged O part on hte inside of the pivot block but it doesn't hold in there. Just comes out. I tried with the O on the outside and it doesn't seem right either. What holds them in? Do I have something backwards?







I've read before that these were confusing and now I agree. Do I need additional parts or more common sense?