Summary

This knob is bigger than the other, it have a dyameter of ~23.5mm. The hole for the schaft have a 6mm dyameter, it may must be scratched to make it fit on the potentiometer. To lock the knob use a 3mm headless screw and then put an o-ring high ~3.5 mm and with an internal dyameter of ~20mm. Print it without support or it will be hard to clean.