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I bought a helix from Troy at Fastlane which is a Black Magic 51. I was told by Troy that this is a 40-36 or 40-34. I have no reason to doubt Troy, but since I am still trying to dial in my clutching, I am trying to verify the helix angles to make sure I know where to go from where I am at. So I call Black Magic and they refuse to tell me what angles I have. To me this seems like a poor business practice when you buy a product manufactured by a company and they refuse to tell you what you have???? Anyone know what angles a BM 51is?? Anyone else have trouble dealing with Black Magic?