John McK - the first thing I do when I get a new guitar is to replace the nasty-plastic pins and ream the pin-holes (which, in the case of modern Martins, are drilled straight-sided). I've now started slotting the holes and replacing the slotted pins with unslotted ones. Easy job to do oneself. I have a theory that properly-fitted pins are equally important as type of material where the sound of an instrument is concerned, probably more so. IMHO, YMMV.