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I'm not sure what you mean by "headstock bolt." There really isn't a headstock bolt, aside from the actual bolt that runs through the headstock, which cannot be drilled into, nor should be.
Are you talking about the top triple clamp acorn nut in the center of the top clamp? If that is the case, I don't recommend drilling and tapping it, as vibration could crack it.
I'm sure there have been people who've modified something on the triple clamp or clipons to mount a navigation unit, but is there a reason why you don't build a bracket coming off the front fuel tank mount or off the fuel cap? Maybe even a bracket that uses the instrument panel bracket-to-frame mounting holes?
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"My life stood-a Loaded Gun- / In Corners-till a Day / The Owner passed-identified- / And carried Me away- /. . .Though I than He-may longer live / He longer must-than I- / For I have but the power to kill, / Without-the power to die-" E.Dickinson
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