Item is non-returnable, unless manufacturer defect is present
Special discounts may apply for high volume sales.
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We don't know where we can find a comparison, but we will tell you that we (myself as a user) think the screw back is a much better option vs. a clutch back. The screw back so much more secure than the clutch back, it's a pain in the *** when you lose a clutch back, less likely to have the screw back come undone.