There are only a few left, or better, no one left ...

There are only a few left, or better, no one left who knows how to do this job.
Excellent courtesy of staff and preparation are a winning mix for those who, for any problem, turn to a store that is not a "consumer electronics" shop, but a sanctuary for nerds.
Whether they are compatible or branded they can support you properly even when the "favor" is free.
Well done, keep it up ...