I have this problem with one of my kerises, whose wood has not been completely cured, and when it goes into my storage room with RH 70%, the wood shrinks and grips the blade so tightly that the blade just cannot be drawn. My method is to leave the whole keris out in a cool room and let the wood absorb moisture over a few days. The wood will naturally expand.
Of course this is easy here in the tropics where RH is frequently 80% to the high 90%s. But I reckon if you put the keris in an enclosed container with a glass of water, a similar effect can be achieved. This could be useful if you do not want to knock the keris free of its sheath.
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