Extending subkey expiration
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Mount master keys flashdrive
truecrypt
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Extend expiry of all keys
gpg \ --homedir /mnt/truecrypt1/gnupg \ --edit-key \ 7F87DE445AE7A7EC3638860A20299C6982D938FB
key N
...expire
...save
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Update public servers, and refresh back down
gpg \ --homedir /mnt/truecrypt1/gnupg \ --keyserver pgp.mit.edu \ --send-keys \ 7A4F38C201F43F111C95A9E575481C55CEC8925D
gpg \ --keyserver pgp.mit.edu \ --recv-keys \ 7A4F38C201F43F111C95A9E575481C55CEC8925D
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Update private key on this machine
gpg \ --homedir /mnt/truecrypt1/gnupg \ --export-secret-subkeys \ 7F87DE445AE7A7EC3638860A20299C6982D938FB | gpg --import