Nitro Rustler Racer

okay along time ago i changed my rear a-arm mounts on my rusty, then the next time i ran my truck they got loose with the new mounts? why is like that? and if i try to tighten it all i will do it tighten a bit and it feels like it stripped. but i didnt stripp it. i was thinking to take a long screw and stick it thorugh the chasis and the mount and put a nut on the other end. what do you think. because i dont wnt to waste money on the mounts like every weel