Modify front seat tilt mechanism?

[Clewtang]

Hi there, I am new to this forum (and berlingo ownership!). I have a 2006 1.6HDI and very pleased with it. One thing I would like is if I could fold the front seats down flatter, is there a way to modify the tilt mechanism to keep going further? Any ideas and info on this is much appreciated, thanks!

[steve valentine]

Passenger seat from the van folds flat.

[muply]

And ive a spare van passenger seat in grey