[Question] DBC Edit

[Chenquie]

Hey, need some help. So.. I'm gonna swap two items, a gladiator sword for a 2.4 sword.

I looked up the id's in MOdel Viewer and found the items in DBC Edit.
I take the Gladiator's .mdx and the other one and put it in the 2.4 Sword's name.

Now they should be swaped right?
I save the ItemDisplayInfo.dbc, then creates a new .mpq archive in MWS.
Add the 'ItemDisplayInfo.dbc' in it and put DBFilesClient\ infront off it.
Now I save it as 'patch-3.mpq' in the WoW/Data folder.

Still don't work. What am I doin' wrong?