Articulating tapping arm.
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Previously:
https://www.homemadetools.net/forum/...200#post188222
https://www.homemadetools.net/forum/...783#post223603
https://www.homemadetools.net/forum/...002#post176037
https://www.homemadetools.net/forum/...078#post191456
https://www.homemadetools.net/forum/...812#post179068