Originally Posted by areal

Here's the final result!
It's not as bad as the previous one... but not yet perfect...
I followed all your advises and after inserting the silicone I put a drop of engine maintenance oil on it and with the tip of a zip tie I molded the silicone in place. (It's much easier with the oil... )

I think the outcome was quite reasonable... do you think it's worth a try on a working engine?

Thanks for all your help!