Ignore my post on the old thread.   Glad you got it done.

Don't know how different the 1.9 Turbo 405 is to the 1.9 Turbo 406 but
Haynes has this for the 406 if it helps.   The non aircon one looks easy.
The other looks a real doozy.

Without air conditioning:
The belt should be adjusted so that, under firm thumb pressure, there is
5.0mm of movement at the mid point on the longest run between the pulleys.

With air conditioning:
Turn the eccentric tensioner pulley to apply tension to the drive belt,
until the load is released from the setting bolt.  Without altering the
position of the eccentric tensioner pulley, tighten its retaining bolt to
the specified torque.

Remove the setting bolt from the automatic tensioner arm, then rotate the
crankshaft four complete revolutions in the normal direction of rotation.

Check that the holes in the automatic adjuster arm and the mounting bracket
are still aligned by reinserting the setting bolt.   If the bolt will not
slide in easily, repeat the process.

Hope it helps,

Keith