Flange nuts, Weld Nut, or Binding Nut can be used to help secure your railbuttons to your rocket.
8-32 threads for 1010 Railbuttons
When installing the flange nuts inside your rocket, depending on the thickness of the body tube, a portion of the flange nut may protrude. That should sink into your Rail Button.
We recommend securing your hole with CA or Epoxy and let dry before these are installed in your cardboard rocket. Also it's a good idea to install these before you slide your fin can assembly into your rocket if you build it outside the body tube.
