Does anyone know the thread pitch and size for the throw-off arm on a P87 Classic strainer? I am restoring a snare for a friend of mine and need to tap a new hole for the throw-off arm. His was snapped off flush and the remaining piece in the throw off was rusted solid and I had to drill it out, so now I want to tap new threads. I don't have any arms around here to check out the size and pitch.

Thanks