Buying ring binder mechanisms (also known as binder spines) is a practical solution for replacing broken hardware in existing folders or creating custom DIY planners, journals, and portfolios. These metal or plastic spines are available in various configurations, including standard 3-ring letter size, 6-ring memo/planner size, and specialized 2-ring or 4-ring options.
You can find binder mechanisms at a range of retailers depending on whether you need a single replacement or bulk quantities for manufacturing. Amazon.com: Binder Mechanism buy ring binder mechanism