I made it so that the flamethrower was attached to the bottom plate and did not touch the sides of the box. To do this, you had to select the part to which the flamethrower is attached, after which an arrow will appear on the right. The top button (hook) means fixing the parts. If you click on it, you can see which parts are attached to the part we are interested in and unhook it. To attach to the bottom, I clicked on Add Connection, then chose which side and what the part will be attached to. (sorry if it's not clear. I'm from Russia, I don't know English very well, and the translator doesn't interpret it correctly. So I have to write myself, which is why everything is so bad)