M200, firmware 1.21, Z-Suite 18.104.22.168 (Windows).
Have a look at the photos.
These are both the same model - one rotated 90 degrees in Z-Suite (for strength, I'd hoped).
They're thumbscrews - just a pair of cylinders, the larger one with knurls.
What happened here? This never was a problem before.
Photos, .STL, and Zcode attached.