You can change the pedal rod yourself, but I recommend trying to find a harp regulator to do it for you. Harps, like people, can shrink as they age so you may need a slightly different size pedal rod than you may think if your harp is older. Contact Peter Wiley (harpdoc.com) or Carl Swanson (his web page is somewhere on this site) and they can give you more info on how to do this if you can’t find someone in the area. I do have Carl’s book, “A Guide For Harpists” that walks you through it. It is intimidating which is why I recommend a professional first to do it for you while you watch, then if it happens ever again you’ll feel better about doing it yourself. You may even find a harpist in the area that has done this before and may be willing to assist, of course it would be nice to compensate them for their time!