S'okay, I remembered what it was overnight. While testing various auger bits for fit, one hit a very hard knot in my test piece. There was a Bad Noise and the lead screw snapped clean off. :~( I was very good, and merely remarked aloud "That's a bit off". And I didn't even intend the groan-worthy pun. Trouble is I've now got a small auger bit shortage in the ever useful 3/4" size - oh well, one'll "turn" up I 'spect (groan).