so look what i know get wep 0/8 and 99 atack stone now take 1 atack from this stone and upgrade it to weapon if succes(if not do it again) u do this
u have 1/8 so 1+1=2-1=1 so take again 1 stone from 99 pack and put it in (if not succes take again) then u have 2/8 now 2+2=4-1=3 (now take 3 atcks from pack and put it in ,if not succes put the 2 stone remain in pack back and take again 3 ) so then u have 3/8 3+3=6-1=5 take 5 stone put it if not succes put back 4 stones then take again 5 etc i tryed this it worked need be same at ref pots try this guys and let me know if work