i was able to fix my problem of locking lug nut but no key!!! an impact wrench and chisel got the job done nicely! too bad i figured it out late but there is a layer of nickle or some really hard metal alloy around the rim of the bolt head. just couldn't get it hot enough for the weld to hold. a little heat goes a long way with an impact wrench. no cutting of studs needed... whoever told me to cut the studs.... there aren't any. they are funny looking bolts. thanks guys for all the advice!