Equip your bow pull back on the arrow but don't fire, (Have about 30-40 arrows equipped) then go to your inventory and attempt to drop your arrows that you have equipped 4-5 times, it will come up with a message. once you've done that drop the item you wish to clone and then leave the inventory, and the item you dropped will multiply to the number of arrows you have equipped!
DON'T use to many arrows or the game may freeze!
Hope i helped :-)
Sig made by Myself!