You picked the wrong bit and now you’re stuck with a hole that’s too big — or are you? Depending on the application you might be able to salvage the piece with these reducing punches from Micro-Mark.
To use these punches, pick one with a ball larger than the hole size, put the ball over the hole, and tap with a hammer. You deform the edge of the hole inward which reduces the diameter — at least at the edge — and that might be just enough if, for example, you’re trying to press-fit a shaft into the hole. These can also help you make domes or dimples in sheet metal.
Sized 1/2″, 5/8″, and 3/4″ in diameter, the three punches can be used for holes sized 1/16″ to 5/8″. The hardened steel heads come attached to 1/4″-diameter, 4″-long steel handles.
The three-piece set will make your wallet $28 lighter.
Reducing Punch Set [Micro-Mark]