Wanted: Scratched or Broken 48mm Camera Filters

Since I can't seem to find a tap for cutting 48mm camera filter threads, if you have any scratched or broken 48mm camera filters (as long as the threads are okay), I would love to have them. I can buy new filters for about $2.50 each, but it seems silly to break perfectly good filters if you have four or five of them that have damaged glass.