Re: I can't get the sensor to fit
Clearly the Russians have a systematic quality assurance problem
So systematic that it caused a single failure.
Now if you'd mentioned the problem they had with defective gas generators being installed in RD-021x engines during 2015/16, which ultimately killed off the Proton rocket, you might have had a point. However, that was due to attempted cost-cutting, which is the kind of thing you expect to see in the west...