“The PMX-680 weighs about twice as much as the PMX-660 (16 vs 32 pounds). Yet the specs are almost identical in every other way. What accounts for the difference? How would I know if I need the 680 over the 660?”
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mfiman, Get the PMX680 if you have 24" stud spacing or if you need an extra two inches of extension compared to the PMX660. Feel free to contact us directly using the support button on our website if you have any additional questions, thanks.
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