How do I go about filling the holes up so I can reset the nuts inplace for the handle. Also my tv cabinet, has two small holes but only one lines up, the other is right next to where I want to drill a new hole. How do I go about this so it doesn't collapse. The holes go all the way through the wood.
The best way to deal with this is to drill out the holes to a larger size to match a piece of dowel rod. The dowel rods come in standard diameters so select one that is a bit larger than the hole that needs plugging.
Cut off the dowel rod to a length that matches the thickness of the door or drawer front. Then use wood glue to completely coat the outside of the dowel and inside of the hole and insert the dowel into the drilled out hole.
Use care to match up the outside surface of the wood with the end of the dowel so the surface is nice and level. Let the glue fully dry.
You can now drill your new hole through the wood where needed for the new handle of pull. If the original wood is a soft wood like pine and the dowel was a harder wood like birch then it is advisable to use a drill guide to hold the drill bit position if the new hole needs to span the transition between the dowel and the existing wood of the door/drawer front.
Before installing the new handle or pull you can use some wood stain or paint to touch up the ends of the dowel so it does not show out too much. If you got glue all over the ends of the dowel and it dried there it will first be necessary to sand this away before trying to apply stain.
You did not mention whether the nut was in a blind position or not. A dowel might help to fill the hole but might not deal with the under lying cause. After filling the hole with a dowel (glued in of course), you might want to install a T-Nut on the back side of the new hole that you have to drill. The T-Nut will provide a larger load bearing area to prevent future pull-out. You will have a stronger joint. This will work best where the exposed surface of the T-Nut is not on a visible or on a finished surface. Here is an image of a T-Nut in a flat piece of wood. hope this helps. rt B-)