Have you ever had a problem drilling a hole in masonry, brick or stone - say putting up a shelf or hanging a gate - and the drill has slipped? The hole is suddenly a lot larger than needed and the holes HAVE to be where you started because what you're putting up has to be just there. Apart from a severe case of swearing, which will get you nowhere, there is a solution.
Try Unibond Repair Express power putty, an epoxy putty that is ideal for repairing, rebuilding, filling and sealing a vast range of materials. The cured putty can be sanded, drilled and painted - so good no-one will ever know!