Repair a Black Broken Hoop Locking Knob?

Cat - N

My friend has a Janome 14000 and was doing a fairly simple ITH appliqué on a t-shirt for her grandson. When she was attaching the hoop to the embroidery arm, the black, plastic, ‘locking knob’ broke off. She switched to a different hoop to complete the project, but would like to get the knob replaced. Is that possible or is she looking at buying a whole new hoop?

Thank you!

- Cat

Typos courtesy of autocorrect. 

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