[DragonX2]

If you have 3 things you can do this.
The 3 things needed are:
Prepare Weapon
Enchant Weapon (or some other form of enhancing a weapon such as Lower Weapon Weight or Increase Weapon Damage, etc.)
diamond.
You say /mark weapon-name (example: /mark vicious axe)
Drop the diamond.
Use Prepare Weapon.
Use the Enhancement Scroll.
There, your weapon is now enhanced.