Well Owen you never cease to amaze me.
I don't suppose you were into model rocketry? I used to make my own rocket fuel out of potassium nitrate, confectionary sugar and sulphur in weight ratio that seemed to work the best. I also bought those premade solid fuel rocket engines back in the early '60's.
Back then you could walk into the drugstores and get potassium nitrate and sulpher right off an aisle shelf. Not now because we're all terrorists I guess. Sad.
But for my home made rockets, I would use what we called "ladyfinger" firecrackers to blow the nosecone and parachute out of the top of the fuselage. Of course the purchased solid fuel engines had a charge to do that...but what's the fun in that? lol.
Keeping the exhaust nozzle secured on the home made rockets was a chore, especially since I used a larger tube to pack the propellant in. Finally I just put two nails through the fuselage after inserting and gluing in a balsa wood insert properly drilled for my lab stand rod, then inverting and using a product called Pourock Cement (concrete patch) to make the exhaust nozzle.
After the cement dried, I would flip the fuselage and slide down over the lab stand and start carefully packing in the fuel, then glue another balsa wood insert with a small hole to activate the discharge for the chute. Then I would glue the balsa wood fins i cut out to the fuselage, and glue a soda straw to the side to slide down over my launch rod. I used nichrome wire and batteries to ignite the rocket.
All early '60's I guess. I wanted to build a liquid fuel rocket but funds would not accommodate on lawn mowing money.