UID of secret key gone!

[Jörg Ziefle]

Hello,

after trying to import my old PGP 2.6.3 key in GPG, I had to discover that
my GPG secret key had lost it's User ID (so that I can't sign with it in
most applications):

joerg@norad:~/.gnupg > gpg --list-secret-key
/home/joerg/.gnupg/secring.gpg
------------------------------
sec  1024D/68FBD67F 2000-01-18 
ssb  1024g/CB70CD4D 2000-01-18

However the public key has still its UID:

/home/joerg/.gnupg/pubring.gpg
------------------------------
pub  1024D/68FBD67F 2000-01-18 Joerg Ziefle <joerg.ziefle@gmx.de>
sub  1024g/CB70CD4D 2000-01-18

Is there a way to recover the secret key, that means to edit the secret
key to get back its User ID?

Many thanks in advance,

Joerg

-- 
Jörg Ziefle             email:   joerg.ziefle@(web.de|gmx.(de|net))
Allmandring 20 D 35     Phone:                   +49 (0)177 4389721
D-70569 Vaihingen       WWW  :   http://129.69.164.234:20104/~joerg
PGP Fingerprint:   D9 13 E5 1F 10 3F 85 C7  A7 8A 4F 9A B5 6F 5B 80