Replacement Pointer Nub Thing

A replacement cap for your [TrackPoint ™ style pointing device](https://xkcd.com/243/).

I built this model to replace the thing on my Twiddler 2 because Steve Mann is my idol.

This should also fit some old-skool Lenovo, Dell, and of course IBM laptops that use nipple-shaped mousing contrivances.

Caveat: I gave this a tall domed top because I'm diddling it with my thumb. If you print this as-is, stick it on a ThinkPad, and close your lid, you'll break your screen. You should download th