One of the most common mistakes is forgetting to switch the format. When you flip the switch from "S8" (Super 8) to "R8" (Regular 8), the claw mechanism physically changes depth. If you project Standard 8 film with the switch set to Super 8, the claw will punch holes through the center of your picture area.
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If the manual's threading diagram is ignored, the film will jam in the gate. Never force the motor if the film does not exit the take-up arm within 5 seconds. One of the most common mistakes is forgetting