Return your drill-press table to dead center
When I have to bore a counterbore on a shank hole at the drill press, the bit change sometimes requires me to lower the table out of the way. Recentering the workpiece under the bit proves difficult because the table tends to swing left or right as it changes height. Here's a trick for perfect realignment: Before moving the table, clamp a machinist square to the drill-press stand, with the blade's edge against the back of the table. After making the bit change, swing the table back into place until it once again touches the square.
—Avrahami Nissim, Garwolin, Poland