I am looking for a Ford forum in French!

My technical vocabulary is not very good, therefore this is not very easy to explain in english...

Here's my problem: I wanted to change the water pump on my Fiesta, and a screw has failed (impossible to withdraw).

What do I do?
My mechanic can do it I think... but thats expensive?!!

I hope to find a forum in French... Thank-you in advabce... and well done for your forum!