After the original plastic part failed (see photo of the gray ring), I needed a replacement. This part isn't an exact match, but does the job.
Steps:
** - This step was somewhat difficult, and I wasn't able to keep the spring that was supposed to go under this part. The spring isn't super necessary, however.
Replaces item #66, part #S549, “Hook Cylinder" from Baratza Sette 270W (and perhaps also Sette 270, Sette 270Wi, and Sette 30).
The author marked this model as their own original creation.