I have recently started drilling holes in a few bonsai pots for wire and also in a few pots without holes to create drainage holes.
With all the methods for wiring bonsai with a limited number of holes, the more important question is around creating holes in pots that do not have any.
What type of drill setup do you use? I have a handheld drill and multiple sizes of carbide-tipped masonry drill bits. This works well for stoneware pots, but takes a really long time for hard clay pots.
Any additional suggestions? Are diamond-tipped drills any more effective? Has anybody tried using a drill press instead? This of course would make it more likely you break your pot, but it would probably go faster in the beginning of drilling each new hole.