It seems like every plastic composite part I try to put on my outcast doesn't want to go on at first. I have to push down ridiculously hard and turn the part at the same time for it to just get a bite. And then it don't want to screw on anymore and gets really really tight when I finally do get it on, like I had to make my own threads or stripped it. Idk I'm new to RC's. Now I'm dealing with the ball cup part and am having no luck getting it on.. any tips? I get most of my parts from tower hobbies.