These are Superb Connectors. They have clamping screws and a flat surface screw on the shaft - double fastening of the coupling on the shaft.
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π Urethane Elastomer Nominal Coupling for Lovejoy Applications
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π₯ Climax 2C 200: The Ultimate Two Piece Clamping Plating Solution
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Electric Guitar Strings Ernie Ball 2221 Regular Slinky - (10-46)
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π§ High-Quality TIMKEN 6203 2RSC3 6203 2RS Bearing - Size: 17X40X12mm
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