Height should be adjustable between roughly 60-80mm. I also changed the magnet slot to fit a 6*3mm(d*h) Magnet. Also the top part was modified a bit to be just round, i didnt like the “spikes” on that part.

I also included a locknut, but due to the pitch of the thread the thing can look a bit crooked when you tighten it up. Could maybe be improved by making the locknut longer or the pitch of the threads smaller.