This is a tool designed to form a nozzle and core burning R Candy or Rocket Candy rocket engine. You insert the tool into the conduit, put the clay in, and use the ram to form the nozzle. Following this, put your R Candy in and use the ram to force the propellant into a core-burning shape. When sufficient propellant has been rammed, another layer of clay is placed in and also rammed.Required - 1) Print both of the files 2) Drill out holes if needed 3) Cut brass tube or rod to the length of propellant + nozzle you intend to use 4) Solder one end of the tube closed 5) Glue brass tube into nozzle die 6) Make sure the ram slides freely up and down the tube 7) Insert die and tube into conduit 8) Insert clay and ram with mallet or compress in vice 9) Insert propellant and ram 10) When you've reached the soldered end of the tube, put some more clay in and ram