On YORF, DavidQ made some round, flat nose cone weights from lead fishing sinkers.
David was cloning a K-11 Estes Wac corporal. These are his pictures -
These are "Bullet Weights" egg shaped sinkers.
Lead is soft and malleable.
A few hits with a hammer to flatten it out, then some shaping and cutting.
You end up with an old school flat and round nose cone weight.
This style weight is a good choice if you don't want to hollow out the nose cone or use epoxy to retain the weights.
The old Estes NCW-1 lead nose cone weight was 11/16" diameter and around 1/16" thick. The diameter would allow them to sit under the shoulder of a balsa nose cone and inside a BT-20 body tube.
A single weight was 0.12 oz.
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