lol there are still ppl left who think they know the enchant exploit ^^
I can tell you 100% that critical hits have nothing to do with safe enchanting... Beleave me that was just luck!
In some servers you can get adena by killing Kai The Cat. worked about 1 weak ago on http://infernons.xz.lt/ but our team got banned. And i gues it's fixed now there. Reply if it works on your server.
You need the item for private store skam? but anyway try Wish Potion :)
Here The Wishing Potion Quest - http://l2vault.ign.com/View.php?view=Guides.Detail&id=32
P.S. you can get other unuseful items by using the wishing potion.