I have one or two. I have one of the concave type, I dthink, and I have a couple that are smaller and knurled. I have an old K in the garage and I check if the thread is the same. Haveing those made will be expensive. Machinists give less of their time away than we do. Maybe you can tune his or his mothers piano in exchange. If you are still interested let me know Newton nhunt@jagat.com
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