Not really grinding & polishing Martin, rather it would be a careful appraisal of the blade & the re-shaping of the profile & minor detail work by a master who understood exactly what could & what could not be done with it to improve it.
This is not work for an amateur.
Martin, the whole legend of blades being original to wrongkos & wrongkos being original to blades is very, very poorly understood by most collectors. Different parameters apply in different circumstances.
For your keris my approach would be to marginally recut the mouth of the wrongko to reflect the shape of the gonjo, I would cut it to be a little larger. Then I would fit a contrasting piece of wood into the re-cut mouth & glue it in place with two part epoxy, possibly tinted. I would then inlet the keris to the wrongko. As I said a complete strip, rebuild & re-polish.
Cleaning the blade before staining means that the metal MUST be white before you begin to stain, not just clean, but white. If it is not so you run a high risk of getting a yellowish or sometimes greenish tint in the final stain.
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