Absolutely ! The C3.1, especially the later models with the more powerful motor, are still the nicest Sebo canisters to use. On mine I replaced the original hose with their new 8 foot long C/K hose that has an off-on switch for the power nozzle and the wand connection integrated into the hose end. I also bought the later all metal telescopic wand. It is one of the nicest to use canister vacuums I have.
I would imagine that you are referring to the ET h nozzle? The “little dial” seams to adjust the way that the brush roll contours to different piles of carpet. I would recommend this video from IBAISAIC at 25:05
Height adjuster. It raises or lowers a little wheel under the center of the nozzle base and that changes the height of the brush roll above the carpet so you can adjust for different pile depths.
ET-Cs and their brother ET-350e's are great power nozzles. No height adjustment but none is really needed.
