Originally Posted by
Andrew R Stewart
I would extend the slot down to close to the lug's bottom edge and round off the bottom of the slot. Seat posts can be harder to make tight is the slot is short. I like a slot at least an inch long. A warding file is what I use. Andy
I thought it a little odd that the slot stopped in the lug. While I can't say for certain, I thought my lugged steel bikes had the slot going through the lug entirely and a little further down the tube.
But since I got rid of my older bikes, I can't double check that.