Where do I find replacement rubber for Glynn Johnson lever door holders?

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Model 69 the part number is 09-310Model 70 & 73, the part number is WSPART.1075
  Issue: One or both levers don't stay horizontal and droop down.   Facts: Falcon T series locks in a high use application.   Cause: Weak or broken springs within t...
The square block is probably the springcage assembly, L283-040.  This component has an internal spring to keep the lever in the horizontal position.