Lost passphrase

[Thistled]

Okay so I have been driven nuts for the last few days, and I am now at the end of my tether.
Bitcoin-QT insists my passphrase is wrong. I am convinced it is not.
There are posts on here suggesting the same. i.e. users are convinced they have not forgotten their passphrase but are locked out.
I have tinkered with some of the ruby scripts on here, and had no success.
Now I am looking at j0hn th3 r1pper to see if that can solve my problem.
Anyone on here used this app?
Do I just run it from the .bitcoin directory and let it do it's thing? Or do I need to do something to config file?
Any help / shouts / advice / pointers would possibly prevent me shaving another 10 years off my life.
TIA
Thistled.

[Thistled]

** UPDATE **

Okay forget using j0hn the rIpper as I have fixed it.

Looks like the Ruby script was not very good at finding my pass phrase until I substituted lower case with upper case.
Man, I though that was what the script was supposed to do.

I more or less had the passphrase correct before it actually found it.
In the end I was only out by about 2 characters.

Thanks for all the help and support.

Thistled.