My latest project is reupholstering 2 throne chairs with heavy upholstery fabric incl alligator-like leather. The original fabric on the chairs had nail head strips. I wanted something different for the reupholstery. I'm heartbroken that I can't use these tacks. When I tried nailing them into the frame with both a tack and regular hammer. These tacks/nails won't go into the wood. The shaft bends, and the tack become unusable. It looks like I have to pre-drill the holes 1st, which is too much trouble for me right now.