First of all: it's not a safe enchant.
Secondly: I play on L2Revenge.
This is not a bug, but I do believe it gives a better chance of succes. I've made:
+18 Forgotten Blade
+16 Angel Slayer (which had SA on it from 12.)
+12 Arcana Mace
+16 Shining Bow
+10 Artemis Bow (Epic weapon)
And alot of +15's and +14's, and +10's which I sold for adena :).
Okay this is what I do:
1. Equip your weapon.
2. Autoque your soulshots.
3. Go close to a NPC.
4. Open your enchant scroll.
5. Hit the NPC. Now timing comes in: At the 2nd hit, you drop the weapon on the floor.
6. Pick up the weapon as fast as possible.
7. Wait 5 seconds and equip weapon.
8. Immediately hit the NPC again. Again, timing: Press the OK button for the enchant, when you hit the NPC for the 2nd time.
Ofcourse, it might just have been luck. But I've made alot of high weapons with this, so I though: lets share it.
I'll let everybody read this (0 posts required), so that everyone can try it and post comments.
GL enchanting!