Rather than building a new base with a column (that finally takes up space in the workshop), for this project, I decided to borrow the Dremel drill stand, which can serve a number of purposes.
I used a collet chuck extensión rod with interchangeable spring collets, according to the diameter of the tap, driven by a tap handle.
I built the horizontal arm out of wood; in the first attempt, drilling the holes for the bearings on both sides, and then the hole for the shaft, the result was bad, the drill bit was not perpendicular to the base. On the second try, drill both holes, complete, from the same face of the wood block, then insert a spacer to set the bearings, resulting in a perpendicular drill bit in both directions.
It's already tested and works fine.
Regrets.
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