You can create a simple query using a basic UPDATE form for insert their new stats in that certain item.. for example:
Code:
USE PS_GameData
UPDATE CharItems
SET Craftname = '010203040506070809' + SUBSTRING (Craftname, 19, 20)
WHERE CharID = 'CharID' AND ItemUID = 'itemuid'
Naturally u must create another query for find the itemUID from the item, but i'm sure u can do it alone!
then idk if other have a better query but this would work.