1. you lock the enchant you want to remain.
2. press enchant to get a new set of stats while the locked enchant remains when you enchant.
you can see here the 1st circle is the stats that i want to change and the 2nd circle is the one that i got from enchanting which is much better than the old one. and the 1500 PATK is still there since i locked it.
It just a coincidence that i got another PCRIT+12 there.
3. replace the old stat with the new stat
here i locked two stats PATK and PHIT and got
as you can see i still have PATK and PHIT here, BTW i used 6 enchant lock just to get those stats.
One question, just want to be clear about this. Let say if you dont have enough stones to enchant and u want to continue the next day. Will the lock system still work. Cause i try it and it won't work. Is it create to be this way or just a bug ?