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Sometimes it can depend on the tools you have. For instance, on my folders I drilled an over sized hole in the tang and then pressed in an oilite bearing. This allowed me to easily ream the pivot hole to fit the pivot precisely and provided a permanently lubricated bearing for the blade to turn on. It also--and here's the tooling part--gave me a second chance to get the pivot hole exactly 90 degrees to the plane of the tang. And, if for any reason the pivot hole was unsatisfactory I could pop the bearing out and put in a fresh one instead of scrapping the blade.
All those methods you mentioned work just fine. Pick the ones that allow you to build a solid, smoothly functioning folder...
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