"Bill" wrote in message
...


There are bit extenders but those typically are of no help on a DP, the
extenders are larger in diameter than the drill bit and will not go
inside the hole.

Unless you are using a Forstner bit--which I thought might be typical for
deep holes.

Ah Bill,,,, you got me there, doh!



Of course, your "pen center" example seems like a
counter-example. I'm not sure of the smallest Forster bit size--I'll look
it up. I assume one could get one with 1/4" shaft (but I haven't looked
yet).

IIRC my set goes down to 1/4" diameter but the shank is 3/8"