Hi Paul, Those are standard Pratt-Reed butts that you can get from the supply houses. I think the S&S ones were a little bit a better choice but the regular ones will work fine. I did replace a set once, including rebushing keys, new damper felts and extensive case repairs. I tall worked out just fine. Isaac hammers as I recall but no improvement in sound what so ever. Go for Abels or Ronson hammers and forget trying to improve the beast. It is just not that easy. Newton
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