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I have the NYCE hinge sensors on five of my exterior doors. The hinges themselves are sturdy. It's the plastic sensor insert in the middle of the hinge that flimsy. When changing the batteries I have overtightened the screws and cracked the plastic so be careful. I contacted NYCE and they sent new inserts for free. Unlike the contact sensors that use magnets, these use a screw-in pin to compress a small tab when the hinge is closed. When the tab is compressed the hinge is considered closed. When the pin decompresses, the hinge is considered open. A problem I had is that the screw-in pin was too short to compress the tab when the door was closed. I solved that by unsrewing the pin and tapping in a small nail to use to compress the tab. I haven't had any problems with them. I put the NYCE hinge in the middle spot so even if it is potentially weeker than the other two, my door is still secure. Hope this helps.
It looks like these door hinges are no longer available. I went to the website to purchase them. They are no longer available in my store or any store near me and are not available for shipping. How can I get my hands on them????
I've purchased a few from eBay and never had any problems. I have the 3.5" in the bronze color on two of my french doors and it's hard to tell they are a bit smaller then the other two hinges unless you are purposefully looking. You can purchase the 4" in silver online from Lowes. You could just purchase one and see how you like it before fully investing.