The pillar-drill thread finally prompted me to get some T-nuts (the sort
that slide in a slot, not the spiky ones) so I can fix my little
vice/clamp properly to the pillar-drill's table.

I was surprised to find the nuts weren't tapped all the way through. The
supplier said they are all like that, so the bolts have to be exactly
the right length. Is that true? It means the bolts have to be
pretty-much exactly the right length.
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