Originally Posted by JB3

Anywhere in the house with extra floor boards you are planning on removing?

If you really want to go with a no nail hole look, get a countersink and plug kit. Drill out all the nail holes with the countersink deep. For thw holes with the nail still in them drive them deeper and remove the drill bit from the countersink and carefully make a plug hole over the nail. (will be harder as the drill bit locates tge countersink bit, but can be done

Use the plug cutter which is a mirror image of the same bit to make circular plugs out of your same age wood scrap. Pop them out with a screw driver and glue them in all the holes making sure grain lines up.

Usually a bit of the plug should be proud of the hole. You can either sand them flat if its close, or taking care to remember the direction of grain, chisel them close so the floor sanding doesnt get hung up and break them below the depth of the hole.

Sand the floor and they will disappear