The ball type of flex-hones are not a good choice for removing pitting of any significance. I've used the 180 grit and finer for honing chambers and forcing cones after cutting them and they work fine for that. But if you think about a ball of what amounts to a grinding stone, on the end of a flexible wire, running across a pit, you can envision it dropping into the pit and jumping out of it. This would/could make for a irregular removal of metal.
Even a makeshift hone with a cleaning rod and bore brush wrapped with a rag and saturated with some Clover carborundum compound would be more effective in my opinion. As a bonus, it's cheap and available at nearly any hardware or autoparts store.
