I designed a replacement nose cone for my youngest's Janod Rocket, after we lost the original. It's substantially based on one module from a "Nose Cone Library" by Garrett Goss, which he kindly released to the public domain. Part of the work is to incorporate a void to fit a small magnet. My contributions are under the terms of Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0).
Originally shared on my blog: https://jmtd.net/log/janod_rocket/
The author marked this model as their own original creation.