What to google to find this cast ring that positions a handle?

[robinbanks]

Couple of the traffic doors in my bifolds have suffered some internal failure of a metal ring that rotates between two spring loaded blocks and encourages the handle to return to a horizontal position. The ring has snapped and I'm interested to know what it's called, so I can maybe buy a bag of them - they look like they'll be a persistent source of a problem

The broken ring is on the very left of the image. No markings on the handle, make and model unknown, fitted to a smarts visofold bifolding door

problem

 

[crank39]

'Handle spring cassette', yours are quite distinctive because they have a hole through the middle for the handle screw so thats a windsor handle, not sure if you can buy a ring or even a replacement casette, it may be that you'll need to buy a complete handle, not too expensive though

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