I recently came across a 1904 Mason & Hamlin grand with a broken agraffe (single string). The stem diameter is .280. Nobody seems to have one this large. Mike Collins at M&H in Haverhill and the guys at Pianotech are suggesting I use an insert and tap it to a smaller diameter but before I go that route I wonder if anyone has any of these sitting around their shop. Any help would be appreciated.
Coming to this very late, sorry about that.
If there is anyone in the world who has such an agraffe, it would probably be Isaac Sadigursky. The good news is that he is a good soul and extremely helpful. If you have not gone another route, contact Isaac.
Before you plug and tap, check to see if they are metric. Many M&H agraffes are, the metric ones sold by Pianotek may fit.