Yes, cutting a keyway in the pesi hole of the gonjo is one of the more common ways of fixing a gonjo in place, in fact, its the method I myself have always used on the kerises which I have made. Sometimes we find that a pesi hole will be made a very neat fit to the pesi, and then fixed by using a punch to squeeze the metal in around the pesi. Bugis keris seem to use this method fairly often.
I feel that perhaps these pics of the pesi may give a useful indication of the age of the wilah.
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