Nozzle is retained in aft end of rocket with appropriate sized washer and bolt circle which provides necessary compression of O-rings at start pressurization. Fins are cut from standard .040 prefinished aluminum stock. White on outside, brown on inside is typical of what one finds. Bond skins together with clear heavy duty carpet tape, this is a 2 sided or double stick tape for installing carpeting or floor tiles. Roughen tang before bonding to airframe.
Grain is assembled with standard acrylic tubing and bars.
Saturate with MEK for complete bonding of all mating grain surfaces. 429-0125, current Price is 17.95. If you don't have a lathe, you can stack up standard washers to do the trick. To use the roll crimping tool, open it it fully so it will slip over the tube. Mark the tube with a felt pen at the exact place you wish the crimp to be.