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I can’t see how difficult access is but you might be able to use a dremil with a stone or with a cut off disc to grind off the rivits rather than drilling. perhaps you could use little brass bolts instead of trying to hammer the new ones. cover up the other parts if you grind to keep the dust away especially from the tuning cap. with the dremil you won’t have to press hard like a drill, just a light touch.