The guy knows about bikes, has been working at this shop since he was 13, but he's not super well-versed in more modern stuff. While he worked on it, he just kept grumbling and *****ing about how ****ty SRAM is. He kept removing the plastic bearing dust shields on either side trying to get it to be right, despite me telling that it's not a spacer, but a dust shield and it's necessary. I just walked away. He eventually got it to roll and shift halfway decent.