How do you repair a broken tab on an Ethernet jack? Here’s how.
First way, my recommendation. Buy some RJCLIPs to use in place of your broken tabs.
Second way, older trick: Use appropriately sized zip ties to make your own jack. Make sure you select zip ties of the appropriate width, else it won’t work. 4.3mm head width is what you are targeting.
Third way: Glue the broken head into a coupler or extension to get a good head back.
20180826/DuckDuckGo repair ethernet jack tab broken off
20180826/https://www.instructables.com/id/Repair-a-Broken-Ethernet-Plug/
Make your own tab protector for an Ethernet cable with a non-broken, non-protected tab.
20180826/http://www.instructables.com/id/Sugru-Ethernet-RJ45-Plug-Protector/
20180826/https://superuser.com/questions/710215/the-locking-clip-tab-on-my-ethernet-cables-plug-is-broken-how-can-i-fix-it
20180826/https://en.wikipedia.org/wiki/Cable_tie
20180826/https://hackaday.com/2010/06/08/simple-way-to-fix-that-broken-ethernet-cable/
20180826/DuckDuckGo RJCLIP
20180826/http://www.rjclip.com/collections/rjclips
20180826/https://www.amazon.com/RJCLIP-Network-Repair-Pieces-Silver/product-reviews/B0131L07RA