I hate to blame the LBS but it's the easiest thing to do lol. I have a rather nice used Campy somewhereOf course the 105 headset had such a shallow stack height that if you'd cut your Fork threads to fit the 105, when the headset wore out, nothing else would fit
So intuitively if your frameset previously wore a different model, the threads will top out in the locknut before the headset is properly adjusted.
Of course the shop that fitted it should have spotted this - but the very fact they've given you the bike back with pay means they've missed something.
