No, the gonjo is never heat treated, in fact, I've never seen a blade where the heat treatment had gone past the tip of the sogokan, or where the sogokan would be if there was one. Very often only the tip of a blade---maybe the first couple of inches---is heat treated.In some Surakarta blades from about the mid-1800's on, no heat treatment at all has been done.
If a wrongko is properly made, it will never damage any part of a keris.
No Ferry, you cannot make a stock of gonjos and hope that if you later have need you can just fit them. You could probably get a few oversize forgings made and have them ready if you need to replace a gonjo, but the gonjo must be made for the blade it is going on to.Everything needs to be precisely aligned and fitted tight.In my opinion it is best to make a gonjo as you need it, if you need to replace one, and if you are making a new blade, then of course you will make the gonjo as required. If you've got to make it anyway, does it make any difference if you make it now, or in 12 months time when you need it?
The saving in making a plain black gonjo for a new keris, especially a large blade, comes in not having to weld pamor, and under the old time conditions, making the job easier by not trying to make the pamor forging big enough to cut a gonjo from it.
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