What is a good way to repair some screw holes that are stripped out on the door hinges
I've used wood slivers or small pieces of match sticks and Elmers wood glue. Stuff the holes with the wood and glue. Let dry then use a small drill bit for a starter hole.
Stuffing steel wool in the hole sometimes works also.
Toothpicks and a good wood glue
Sharpen a wood dowel in a pencil sharpener, put some glue on to the hole, then tap the sharpened dowel in tightly. After the glue dries, cut the dowel flush. Sand it if you need to, then drill a new hole and put in the screw.
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I recently repaired the original rear wood floor in my 11 touring that had stripped screw holes. First I went to home depot and bought the appropriate sized hardwood dowel, next I drilled the stripped holes out to the dowel size. Then I put a little wood glue on and pressed them. Let it dry over night then sand to height. Paint then drill new pilot holes, install in car.
John, Don Lang sell's a product called Kwik-Poly.
IT is on page 255 in the 2017 catalog. I am a furniture upholster. I use it on antique pieces that have been screwed, nailed and tacked so many times that the wood is all messed up. It fills all holes. All you have to do is sand it when it's dry and drill a smaller hole than your screw.
Toothpicks work well because they are hardwood. This is a good, effective repair for light duty joints like door hinges. Fluted dowel pins work well also for light duty repairs. The trouble with pins is that you will then be threading screws into end grain; not the strongest scenario.
A stronger repair, which should be used if there are safety issues involved, is to buy a 1/4" or 3/8" wood plug cutter with matching taper drill bit. Cut some plugs from a piece of flat sawn hardwood like maple, ash, or beech, then drill out the holes, fill with good waterproof carpenter's glue, and tap the plugs in place. Let it dry good and then sand, chisel, or plane the plugs level with the surface. You will end up with threads stronger than the originals.
Do as Keith T. suggests.
I use bamboo chop sticks and Elmer's or Kwik-Poly.