[Sneeck]

I've filed my racer x arm's down too to make them fit ga bulk's. Big deal, they work like supposed to and the rough finnish won't make them loose performance. Unless your building a show off truck.

About the snug bearing fit, if you really don't see a way of getting a bearing in there without modding it, send it back to flm. You could sand it down yourself, but to much and the bearing will wobble, causing the diff to prolly self destruct.

Also problem's happen when building these type's of truck with part's from different mfg's. Need to get used to it that it's more than screw part a onto part b.