Focuser 1.25

I decided to motorize my telescope and I'm updating many of the parts I had done a long time ago when I still had few tool options.
My previous focuser was a helical model and made of Polyvinyl chloride.
Today, with a lathe and a printer 3D, I can already leave for new challenges.

It is possible to use 4 springs combined to the 4 M3 screws.
So the grip will be smoother. In this case, change the M3x16 by x25mm,

If decide to use the printed tube, i created it just for testing, you can use a piece of heat shrink tubing on the threaded rod to avoid scratching the tube body too much.

4 624zz bearing
2 MR105zz bearing
4 M3x16 screew (or 4x25 using springs)
4 M4x12 or 16 screew (i used 12mm stud)
1 M5x80 (or 90) threaded rod
2 M3 stud
6 M3 nut
2 M5 nut
1 1 1/4 (1/8 thickness) aluminum pipe

Edited #1
The previous knob was oversized. Replaced by a 20mm.