Logitech Driving Force GT DFGT sequential shift stick

Designed this Sequential shifter shaft for the Logitech DFGT wheel. The idea is for you to design (and please post as a remix) the top part using the 16x16 square shaft.
This is a replacement for the original part, leaving you with the original part without breaking it.

The wrench in the photos is from https://www.thingiverse.com/thing:4635007

To remove the original shaft you have to:
1. Unscrew the nut below the base
2. Remove the original stick from the base
3. Separate the two half balls
4. Uncap the silver top from the topo ball and remove the long black bolt

Then use the bolt and nut you just removed for the new shaft. I uploaded the Fusion360 file for tunning the cone tolerances for your printer (you can upload the stls as a remix). Please attain the license!
The stl I uploaded in for the ender 3 though it needed some finishing.

Printing:
Print with at least 2 walls 30% infill. I printed it upside down (square to the plate) and with a generous brim (at least