Use the clearance-hole-sized drill to "spot" the column for the tap drill, then tap drill and tap with the mountings still in place. Let the mountings guide the tap.
Paul in Pittsfield
--- In GrizHFMinimill@yahoogroups.com, "johann_ohnesorg" <bigdukeone@...> wrote:
>
>
> Make the mountings, fix them to the column with a C-clamp in the place where you need them. Drill center hole, take away the parts, cut the threads. Done.
>
> Cheers,
> Johann
>
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