I have designed a 3D model of the Estes PNC-50SP nose cone that will fit Estes BT-50 airframe tubing.

There are two files to download. One is the nose cone itself and the other is the end cap which has a 3mm hole in it to allow you to add a screw eye or eye bolt.

Estes kits that use this nose cone:

Kit# 1341 World Federation Space Probe
Kit #1361 Skytracer
Kit #1364 Falcon Commander
Kit #1373 Soaring Eagle
Kit #1909 USSF Fireflash
Kit #1933 X-16
Kit #1946 Starhawk
Kit #1988 Argosy
Kit #2140 Venom

https://www.thingiverse.com/thing:4620461