Thank you Shahrial for your further clarification of the place that the technique of boiling a hilt free of the pesi occupies in your part of the world. I can now understand that this is far from being a generally utilised practice, and it seems that perhaps it may be used by only a very few people. It is comforting to know that the practice is not as widespread as it initially appeared to be.
This keris that you have shown a photo of will very likely take an extended period of time before it gives up its hilt. I have encountered several cases where I have needed to heat and reheat over a long time before the hilt finally came free. In all cases the hilt materials were other than wood; one was ivory, a couple were horn, one was probably rhino horn, and one was very similar to the hilt on your keris.
In a couple of these instances, when the hilt finally did come free the pesi was only about as thick as a darning needle, inside the hole in the hilt there were layers of rust. When a pesi is as badly rusted as these were it is very easy to break , so you need to proceed very carefully and do not overdo the twisting action, rather apply very little twisting force, and try to pull the hilt free by gripping the blade with your left hand and pushing your thumbs against one another.
In other instances I have found that perhaps half the length of the pesi has turned completely into rust.
I would suggest that you heat the sorsoran, combined with gentle twisting and pulling action, every day or so, over an extended period of time. Be patient with it, it doesn't matter if it takes several months before it comes free, but the repeated heating and cooling with loosen any bond over time. If you grip the blade about halfway down, and apply heat to the sorsoran, when the blade gets too hot to hold, that's the time when you stop, you set it aside until it cools a little and then repeat, probably about 15 or 20 minutes at a time is sufficient to work at it. Then come back to it again the following day.
The silver (?) cover on the gonjo should not be a problem, but of course you will ensure that no direct heat is applied to it.
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