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Tactile paving multi-drill.
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Previously:
https://www.homemadetools.net/forum/...437#post173626
https://www.homemadetools.net/forum/...633#post155533
https://www.homemadetools.net/forum/...616#post151713
Just goes to show that your drilling jig is only as good/accurate as the operator wants to be.
If the pattern drilling is only to achieve a semblance of a safety texture then I suspect the pattern itself is the goal rather than precision placement or true perpendicular bore holes. But I would think that a concrete saw cutting a series of shallow groves would be faster more efficient and provide a safer anti slip surface