The 411 Pinch Clamp is the same as the Mercedes pinch clamp.
You will need this to hold the distributor in place on the Datsun 411.
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These distributors have state of the art electronics. You should have a good understanding of the basic principles for installing distributors. ALWAYS! confirm your timing at the crankshaft against a point in the app with a timing light. This will sync the app and the motor.
If you do not feel qualified please reach out to your mechanic.