problem with forgotten passphrase, no revocation certificate available.

[Faramir]

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Well, I made another key, for "playing" with it. Unfortunatelly, I
didn't make the revocation certificate that day. Now I was going to make
it and... surprise! wrong passphrase... Well, I was not happy with this,
but since nobody would be using that key to write messages to me, I
thought I could just delete it... but on second thought, I searched it
in a key server... and the key was found.

   So, here is the question: Can that public key cause problems, if I
associate another key with the same email account?

   The only explanation I can think about is I forgot one of the
"mutations" of the passphrase, probably 2 characters, but that would
mean to test about 1000 different combinations, and I won't do that
manually. Is there any tool to automatise the process? The key is on my
private keyring, and I don't know how to extract it without knowing the
pass...
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