X1C5 comes with two versions https://patchwork.kernel.org/patch/9768231/ of TrackPoint: ALPS and Elantech. I confirmed mine has an Elantech one using TrackPointDetect.exe .

Cursor Speed & TrackPoint Cap

I used to take the plastic adapter



from my previous laptop - a Thinkpad E130 and trimmed a Soft Rim Cap to fit “Super Low Profile”. ⊕ IMHO, a soft rim is much better than a soft dome.





I have switched to a 3d-printed rubber caps made by Saoto, it works really great.

The cursor speed and acceleration gets much better.