I got fed up with my crummy FSA Gossamer crank and had my LBS install a new Shimano 105 crank. I'm new to the area and it was the first time I had them do any work.
Finally took it for a spin this weekend, and there was a noticeable "hitch" in the pedal stroke when my left foot was coming over the top. Rather than stop, I pushed through, thinking that it was just my old cleats popping out of the pedal a bit. I got home and checked things out for real, and I noticed that the non-drive side crank arm was loose as hell. The bolts were not even finger tight -- it looks like the shop guys just forgot to finish the job. I immediately tightened them down to spec (12-14 nm), cleaned and lubed the bike, and hung it back on the wall.
It was only a 20 mile ride, and I'm in early season (read: bad) shape, but I did do a couple of climbs on it. Any chance I did any damage to the BB shell or anything else down there riding with a loose crank arm like a lunatic? The arm never slipped or came off or anything. Just wondering if I should go back to the shop and have them check it out, or if I avoided disaster by tightening things up after 1 ride.