Hello, do not worry, fixed to the chassis taking advantage of some pieces that had aluminum, the cabin has three screws fixed with epoxy and subject with pieces of plastic in case they are detached that do not move, they are hexagonal screws, the used nut It is one of those that take a brake but not naylon, I put some pictures, ask what you need to know that's what we are for, a greeting
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With these nuts you do not have to tighten too much