Yes the encoders worked well, it's just that they are of very poor quality.
There is a lot of "clearance" in the axis ( I don't know how it is said in English ).
I replaced the universal encoder on my previous Siglent scope because it was difficult to press the button without changing the setting.
This must be less annoying on an oscilloscope with a touch screen.....and on an oscilloscope paid 1200 €.
I paid mine more than 1800 € so I found it annoying to have such crappy encoders.