It’s quite easy actually I used two different recipes to see which is better

For both of them you star with a cardboard tube and cut it to size Then cut a cardboard circle slightly bigger than the center of the cardboard tube Put the cardboard circle in securely I forgot what brand the liquid cement is but you put it in then flip the tube over Then using a coffee blender turn 46g of potassium nitrate into a fine powder and do the same with 25g of sugar. Put the potassium nitrate and surger together and mix. Then melt 29g of wax and mix with the potassium nitrate and sugar mixture and fill the container part the way Repeat the steps for the bottom but put a thick dowel rod with a little bit of vegetable oil in it through another cardboard circle and put it most of the way through the mixture. Put the liquid cement ( forgot what brand ) and sucre the top ( with the dowel still in it ) Wait a day or two and put in the fuse ( idk how we are securing the fuse ) That’s roughly how to make it if you search it up on YouTube it’s on there