Except for the fact that the Procunier tappers also work great on drillpresses. That's how I run mine!
My rule is, if it's more than two holes, I save time by putting the procunier into the chuck.
Jim
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I had one of those apart and as I recall it the radial runout between the driving spindle and the tap in the tapping head is designed in and intentional. Sort of like a floating reamer holder. That may be intended to allow for minor misalignments and avoid tap breakage.
I don't disagree with the comments that the Procunier is a better tapping head though.
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