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Do you need to replace a fin from your Estes Doorknob kit or need to scratch build your own? I have the STLs for you to download for free from Thingiverse. You can print the fins flat or with the airfoil and with or without the tab. I also have a couple of fin making templates in order to scratch build your own from balsa, basswood, or other material.
https://www.thingiverse.com/thing:6339772
https://www.thingiverse.com/thing:6339772