crafting uniques plz help

Hey, new to this forum

I got a warrior and use the unique hamer 'The Stone Breaker'
+30 health, 15% damage, lengthens weakness on foes 33%, -5 energy

anyways i was wondering cause its a unique green item can i add like a new handle to it and upgrade and add a better shaft or wateva?

if so does this get rid of any of its bonouses it comes with or replaces them

thx

Unique (Green) items cannot be upgraded in any way. All other weapons, gold, purple, blue and white can be upgraded with prefixes (i.e. Heavy), suffixes (i.e. of Fortitude) and with the introduction of Nightfall, inscriptions (i.e. Strength and Honor).
If you add one of these upgrades to a weapon which already has an upgrade of this kind, the old one will be replaced.

You can't upgrade/mod the green items.

ok thx for letting me know, appreciate it