It should turn very smoothly. But that does not mean the CLA was bad. It could just be a very old and worn camera. I have a 50/1.5 Summarit that I acquired quite cheaply but with a stiff but not unusable aperture ring. I sent it to DAG for CLA. he did the work but reported back it was as loose as it was ever going to be because it was so old and worn.

Personally I'd take pass on this one unless you plan to use for slow and methodical studio or landscape work. For street or documentary style portraits or photos I cannot imagine working with such a stiff aperture ring.