A few years ago, I purchased a pair of used M803's that had the tweeter pushed in during shipping. I was able to purchse a new tweeter (the guts) for around $120 from a dealer. Very easy to replace, especially since B&W did not solder their wires but instead used push on connectors, at least on the M803 tweeter. Regarding repair, do a search on this forum and audioasylum as this has been posted many times. In brief, you can try various things to make the dent go away, but will probably never fully "repair" the tweeter to like new condition. OTOH, you may never actually hear the difference. Play some tunes with clear high frequencies on mono and compare between the "damaged" speaker and the "undamaged" one, to see if a repair or replacement is needed.