Look at your chassis and you'll see that flat-head screws coming up from the bottom is just what it was designed for. If you buy an X - 60 (which was released first) that's just what you get. The threaded area only goes up a little way because it would be a real drag to have to thread the screw the entire way, and all that thread is not needed when coming up from the bottom.
Like everybody else, our chassis tool has a removable insert that lengthens or shortens the chassis. Insert in = X - 60. Insert out = X - 6 Sq. We knew the truck would be released first, so that's where our heads were and there we made a mistake. The screws coming up from the bottom are too tall for the buggy body.
So the buggy comes with four long flat head screws to come down from the top. Here in the US, where often the battery is rarely removed from the car, this works OK. But when you've got to remove the batt for charging, eventually the threads in the chassis will fail, and studs with low-profile nuts is the way to go.
Lock-Tite 'em in and most people have no problems.
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