While I agree that the design of the back cover is a weak point of the HRM-DUAL, I will give a shoutout to Garmin for their support. I messaged them that the screw hole on my HRM-DUAL backplate had broken, and then sent me a brand new replacement (the retail boxed HRM-DUAL) free of charge. Only info I had to supply was the serial number. And this was two years after my original purchase.
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