Hi, I have several of these Lotus Flutes or Swanee Whistle. They were made in England. The one with the bone top is the De Luxe model. If I'm right, your flute has an inner metal cylinder. You can use any lubricant. The oil for slide trombone is OK. Be careful with baquelite. Don't expose to light or hot water (it loose the black color). Clean with a lightly moisted cloth. Dental thread (or any slim one) is the best way to ensure the top. Further information in my blog: http://queinstrumentomasraro.blogspot.com It's in spanish, but you'll can find the way to contact me. By the way. I'm a collector of this kind of flute. Let me know it if you decide to sell yours. Best wishes! Arturo
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